To be avoiding calls from my dad?

[Moomichi]

My parents separated when I was 11. It wasn't really a big deal for me as I could see they weren't happy. Mum instigated it and dad would have got back with her at any point. I often feel like he still would. Mum remarried after having a few affairs with married men.
Dad remarried twice after my mum. Jumped in feet first and often felt like he proposed instead of a third date.
His family were pretty strange and he's been looking for the perfect family even though that doesn't exist.
Anyway he's currently going through a break up and for the past few months he's been ringing me up going on about it. I know far more than I need to know including stuff on their sex life.
I'm starting to dread speaking to him and I don't want to be that way.
Aibu that I don't want to be his friend? I have a family of my own including a young baby and I feel like he doesn't get that. He sometimes calls and then says grumpily 'ring me back when you can talk' and I feel like saying 'speak to you in ten years then'😱
I'm not good at confrontation and I know if I say anything he will sulk but I'm struggling with it a bit.
Wwyd?

[Moomichi]

True, it's kind of what I do though! I just don't get why he thinks it's appropriate :(

[wheresthel1ght]

He clearly has no one else to turn to. Yabu for being so mean. Talk to him and explain that certain topics are off limits.

[Moomichi]

I have asked him before not to tell me that sort of thing. I know more about my parents relationship than I should. :(