Last night, my partner whom I live with (who we'll call A) was with a prospective partner (who we'll call B). I have not met B nor talked to them in any way. A and I had agreed that before doing anything romantic/sexual with B, B would have to meet and pass my vibe check.

A did not ask me if I would be ok with them making out with B, and proceeded to make out with them last night. I only found out this morning, when A had hickeys on their neck. When I saw, I felt very hurt. They understood and apologized, but it didn't make me feel any better.

What should I do? I keep feeling more and more hurt when I see the hickeys and think about how they didn't even bother to make sure I would be ok. I don't want to yell at them or hurt them in any way, but I have a lot of unresolved feelings that I can't suppress.