Female-assigned at birth sexual and gender minorities (FAB SGM) are at elevated risk of experiencing intimate partner violence (IPV), yet little longitudinal research has been conducted with this population. In the current study, we attempted to understand how patterns of IPV victimization and perpetration, measured across a wide range of IPV behaviors (psychological, physical, sexual, cyber, and SGM-specific), changed over time for FAB SGM youth. Participants came from a longitudinal cohort study of FAB SGM late adolescents and young adults (FAB400; = 488) and included anyone who reported a romantic partner at one of the first three waves (six months apart; = 433). Latent class analysis (LCA) was run at each wave to determine the best-fitting class structure across IPV experiences. These were followed up with latent transition analyses (LTAs) to determine patterns of movement between classes over the course of the three waves. Lastly, we looked at the effects of staying with the same romantic partner on transitions. We found that the same three-class structure replicated across all three waves of the study. That class structure identified no/low, psychological, and high IPV classes at each wave. In the LTA, when transitions occurred for FAB SGM, they were much more likely to transition to a class defined by lower likelihoods of experiencing IPV (i.e., psychological to no/low) than they were to a class defined by higher likelihoods of IPV (i.e., psychological to high). However, we found that FAB SGM youth were less likely to transition to a less severe IPV class if they maintained the same serious romantic partner across waves. This finding, in particular, suggests that IPV is often relationship specific for FAB SGM and that efforts to reduce IPV in SGM communities must consider intervening at the relationship level to effect meaningful change.