Please tell me I’m not crazy.. or do!

My fiancé and I have been together for 2 years... him and his child’s mother have been apart for 3 years...

he still puts him in her car while she watches over the car door, closes the door for her and waits till she leaves and then comes back inside... this bothers me so badly! Actually everything about this woman annoys me, he always would tell her if we broke up or got back together he told her when we got engaged like why?! I’m pregnant with our first child and he says its to be respectful to her

Why do they need to tell each other so much information like why?

I try to bring it up too him and he just tells me I need to just basically get over it

Me and her don’t get along because she got mad I stopped waiving at her when she picks up, I’m pregnant and engaged with her sons father not just some girl he’s dating or bringing around