This isn't just about accepting he makes mistakes/disappointment not when he says he will be there and then isn't.

I'm not sure what he is doing Solairee but a frank discussion with him is in order to determine if you both can move forward. This sort of thing destroys trust and I can't find the therapeutic value in that.

You mentioned last time you were there you felt you got some power back because you were assertive. Try and hold on to that feeling.