Add conflicts: jealousy, cheating, ghosting, sulking, trust issues, boredom, silent treatment, emotional distance, commitment fears.
Let lovers react if you ignore them, hang with others, or act shady, like being sulky or getting mad.
Add breakups, makeups, messy or mutual, and ways to rebuild trust. Ex's things are really needy (Ex's interaction based on personality and past experience, war between ex and your lover,...)!
For open/poly relationships: jealousy, scheduling, feeling left out, rule negotiation, emotional vs physical boundaries, ...