Ok so since early this year to now I've managed to cut the phone calls, any topic that's not about our child completely.
Our son is an infant and now he's requesting to video chat, have phone calls and conversations with out infant son. I find that weird cause he can't talk to to the fact that he's a baby

.
I'm working on getting full custody for good reasons, he will get supervised visits wich is great.
My question is how can I have as little contact with him as possible. Everything we talk it ends up horribly. Eg, he's depressed, too sentive, picks fights, talks about the breakup, rubs his new relationship in my face (everyone but him knows as long as he doesn't get help it won't last long), try's to talk about everything but our son. Wants to be friends but I don't want his friendship. Tells be about his self harming, make light threats like hes not going to visit cause he not sure what he's going to do in a negative way and wants me around (one of the reasons why I want supervised visits & not by me)
I don't want to be in contact with him, he's so negative. I need to find ways to be in as low of a contact as possible, any advice? Personal and legal?