my advice is to cut him off...he starts talking and you cut him off midsentence with something like, you know son and I really have to (fill in the blank...I used run to the grocery store a lot) and then say something noncommital like talk to you later...bye...close door
it looks like this (ex) oh NM...i ordered this great new phone that... (NM) I am sure that is cool but darling son and I need to get ready for bed so we will just talk to you later, ok, (closing door) bye. Door closed, locked
don't respond to his texts or if you need to respond with one word...busy
he may ask what is up after a bit and you can say, well you know buttmunch, the deal is this...I have enough friends in my life right now and I think it is just best if we concentrate on being the best parents we can to babyboy. I am not really interested in your daily life unless it pertains to our son. I'm sure your a great person but I lost respect for you when you made the decision to leave and I find it difficult to be friends with people I don't respect
)I needed to work up the courage to say this so then I added)
I am really sorry and I would love to stay and talk about this but I am meeting my friend for icecream and I need to go, ok? Bye