So im baptising my son in 3 weeks and his father opted to help pay for the little party I'm throwing…

So im baptising my son in 3 weeks and his father opted to help pay for the little party I'm throwing him, nothing no big about 40/50 people. Well we had a really bad breakup since he cheated anyways I told him he's more than welcome to come to mass and see his son. My bf won't be there. Well kids father wants to bring his girlfriend. I said no. And that after she said my son wasn't his why would you bring her to his baptism?! Well since I said no that it's a family affair and she's not invited said that he wasn't coming. So pissed! This isn't one of those oh I'm being a crazy baby mom. You disrespect my kids you get no sympathy from me!!! Am I wrong?!