Efforts to prevent intimate partner violence (IPV) have been informed by emerging research on common triggers of IPV and the importance of engaging with couple dynamics. This paper reports on secondary data analysis from the qualitative evaluations of the SASA! intervention in Uganda, (conducted in 2012 involving 40 community members) and the Indashyikirwa intervention in Rwanda, (conducted between 2014 and 2018 involving 14 couples and 36 other stakeholders). It explores the under-researched linkages between romantic jealousy and IPV, and describes how these interventions mitigated it. Overall, jealousy was common in both settings, and led to relationship challenges including breakdown of trust; quarrels about resources; conflict, controlling behaviours, and ultimately, physical and emotional IPV.