Almost one in two couples filing for civil divorce in Singapore last year cited unreasonable behaviour as the reason for their marital breakdown, making it by far the most frequently invoked ground. The Department of Statistics reported that unreasonable behaviour accounted for 48.7 per cent of all non-Muslim divorces in 2025, painting a striking picture of how modern marriages dissolve in the city-state. By contrast, adultery emerged as the least common ground, featuring in just 0.9 per cent of cases. This dramatic disparity reveals much about the mechanics of Singapore's divorce law and the strategic choices couples and their lawyers make when navigating marital dissolution.
The picture changes considerably when examining Muslim divorces adjudicated under the Administration of Muslim Law Act. There, infidelity rises to become the second most commonly cited issue, accounting for 18.4 per cent of cases, trailing only personality differences at 21.5 per cent. This marked difference between civil and Muslim divorce statistics has prompted legal professionals to caution against misinterpreting the numbers. The divergence does not suggest that adultery is substantially more prevalent among Muslim couples, but rather reflects fundamental differences in how the two legal systems are structured and how reasons for divorce are recorded and categorised.
The legal architecture governing each system explains much of this variation. Civil divorces in Singapore operate under the Women's Charter, which recognises only one legal ground: irretrievable breakdown of the marriage. Parties must establish this breakdown by proving one of six facts. Three of these are fault-based—adultery, desertion, and unreasonable behaviour—while two are non-fault-based, hinging on separation periods of either three years with mutual consent or four years without consent. A sixth fact, divorce by mutual agreement, was introduced on July 1, 2024, and has already become the third most commonly cited ground. In contrast, Muslim divorces fall under AMLA jurisdiction and are heard in the Syariah Court, which does not operate within a statutory framework of prescribed facts but instead applies principles of Muslim law to assess each case.
Proving adultery in civil proceedings requires a level of evidence and effort that many divorcing couples find impractical and unnecessary. Establishing infidelity typically demands strong circumstantial proof—private investigator reports, photographs, videos, or similar documentary evidence demonstrating a sexual relationship with a third party. This evidentiary burden makes pursuing adultery as a ground both costly and time-consuming. Lawyers note that parties whose marriages have genuinely broken down due to infidelity frequently pivot to citing unreasonable behaviour instead, which requires no proof of sexual involvement. The shift proves strategically sound: demonstrating that a spouse has behaved in ways that make cohabitation unreasonable is substantially easier and carries less emotional acrimony than forcing the other party to defend against explicit adultery charges.
Unreasonable behaviour, despite its seemingly vague terminology, encompasses a broad and practical spectrum of marital discord. Family law practitioners identify family violence, verbal abuse, controlling conduct, substance addiction, gambling problems, financial mismanagement, parental neglect, and extra-marital affairs themselves as falling within this category. What makes unreasonable behaviour particularly attractive to divorcing couples is its flexibility and accessibility. When a divorce proceeds uncontested—which constitutes the majority of cases—parties need not marshal elaborate documentary evidence to substantiate allegations, as the respondent does not dispute the claims. In contested proceedings, the evidence framework widens to include messages, bank statements, police reports, medical documentation, and testimony from witnesses including neighbours, family members, or counsellors. This accessibility contrasts sharply with adultery's demanding evidentiary threshold.
Practical timeline considerations further tilt the balance toward unreasonable behaviour and away from both adultery and extended separation grounds. A spouse citing unreasonable behaviour can petition for divorce immediately without waiting years for a separation period to elapse. Those relying on three-year separation require mutual consent to proceed, while those invoking a four-year separation without consent must endure a prolonged period of separate living before filing. For couples determined to exit a marriage, unreasonable behaviour offers the fastest path forward. Conversely, pursuing adultery requires not only overcoming the evidentiary hurdles but also managing the interpersonal hostility that such an accusation invariably generates. Legal experts emphasise that unreasonable behaviour is simply easier to prove, costs significantly less to litigate, and avoids the psychological and relational damage that adultery proceedings inflict.
A critical distinction separates how the two legal systems record the reasons for divorce. In Muslim divorce statistics, the Syariah Court documents the reasons that parties themselves provide for their marital breakdown—essentially capturing the couple's own narrative about what went wrong. Civil divorce statistics, by contrast, record the legal facts that must be formally proven under the Women's Charter framework. This methodological difference explains why infidelity features so prominently in Muslim divorce data while remaining margininalised in civil statistics. A Muslim couple might truthfully identify infidelity as the principal issue that destroyed their marriage, and that statement would be recorded as given. A civil couple facing identical circumstances would instead require legal evidence of adultery or would strategically reframe the infidelity as unreasonable behaviour for procedural efficiency. The statistics thus reflect not the actual incidence of adultery in marriages, but rather the legal and strategic incentives embedded in each system.
The introduction of divorce by mutual agreement in mid-2024 has already begun reshaping the landscape of divorce grounds in Singapore. This option, which removes the necessity to apportion blame or prove any particular ground, appeals strongly to couples seeking an amicable separation and has climbed to become the third most cited fact just one year after implementation. This trend suggests a broader movement toward de-emphasising fault-based grounds in favour of procedures that minimise conflict and acrimony. The mutual agreement pathway removes what legal professionals call the blame game, allowing couples to dissolve their marriage without requiring one party to characterise the other's conduct as unreasonable, adulterous, or deserving of blame. For Malaysian readers, this development is particularly instructive, as discussions about modernising family law increasingly focus on whether fault-based grounds serve productive purposes or merely inflame family disputes.
The implications of Singapore's divorce patterns extend beyond statistical curiosity to reveal how couples navigate family law frameworks in practice. The overwhelming prevalence of unreasonable behaviour reflects a sophisticated ecosystem in which divorcing parties, guided by lawyers, select the ground that best achieves their goals—swift dissolution, minimal evidence gathering, reduced acrimony, and lower costs. Adultery, despite being a seemingly straightforward ground, has become functionally obsolete in civil practice, retained on the statute books more as a legacy provision than as a regularly utilised option. This evolution demonstrates that formal legal categories matter less than the practical pathways available to litigants. For the region, Singapore's experience raises questions about whether fault-based divorce grounds serve contemporary family law's interests or whether streamlined, no-fault alternatives better serve the interests of divorcing parties and their families.
For Malaysian readers and policymakers observing family law developments across the region, Singapore's trends offer valuable insights into how divorce law functions in practice. The data underscores that what legislators write into law and what practitioners actually use can diverge significantly, driven by evidentiary demands, financial costs, and emotional considerations. The rapid uptake of divorce by mutual agreement since its introduction suggests strong demand for less adversarial processes. As Malaysia continues deliberating its own family law reforms, including potential amendments to Islamic family law and discussions about civil divorce procedures, the Singapore experience demonstrates that expanding no-fault options and reducing reliance on fault-based grounds can align legal structures more closely with how couples actually navigate marital dissolution. The message is clear: when given less combative alternatives, most divorcing couples choose them.
