Relationship advice

I’m 4 months pregnant and my bf has a previous marriage he has 2 daughters. I’ve been through a lot of problems w his ex she’s so disrespectful to me she even called my baby a bastard . Well today is my bf daughters first day of school and he wants to be there but his ex is gonna be there I’m upset to be honest . Am I being unfair ?

UPDATE!

So I might of sounded crazy and selfish but my gut feeling was right . He broke up with me after dropping off his daughter and meeting up with his ex .