Did you skip the part where it says to stop taking to heart all the negative stuff they say? Did you forget that you are supposed to ignore that?
You are letting him run roughshod over you when he spews out negatives and you just gobble them up like poisoned candy...
Not ready to be his friend?
I would tel him if he's going to walk out on four years of marriage without batting an eye over it or even speaking to a family therapist then you don't want to be friends with someone like that. I would tell you want to be friends with people who respect commitment.
I would tell him why be friends? Clearly he's not reliable so why maintain a friendship with someone you cant' rely on...
You are just letting him walk all over you here... speak up for yourself...