Ex in delivery room???

My BD and I broke up and he’s living with a woman in her 40s now. He’s been nothing but disrespectful towards me; telling me he’s gonna take me to court if I don’t give my baby his last name and 50/50 custody but then expects me to let him be in the delivery room. He’s an embarrassment. We were together a long time; all our friends new of us as a couple, but now he’s with a woman old enough to be our kid’s grandma. I know some of you will be mad that I’m talking about her age but it’s embarrassing and hurtful to be left for a woman twice your age and you’re pregnant with the guys only child. Her age is just another slap in the face as if he hasn’t slapped me in my face enough already. I expected him to stick by my side. I expected him to be a dad EVERYDAY not 50%. I expected us to take care of our baby together.

Anyway I need peace so I don’t want him in the delivery room. I want my Mom and that’s it but of course he’s tryna make me feel guilty about that. I hate him. Why should I share that with him and he’s sleeping with someone else every night?