He's probably gonna leave

My boyfriend and I hit a rough patch this week. My cousin decided to kiss him and I obviously got mad and hurt. He continues to text her trying to be her friend, I asked him to stop because it makes me uncomfortable. He does it anyway so we've been arguing a lot and that last thing he said was see you Sunday. I'm afraid he's gonna break up with me on Sunday.

Did I mention I'm pregnant and haven't told him yet? I don't think I'll tell him if he breaks up with me

Do y'all think he's gonna leave?