Welcome Newkay,
I am sorry you are going through so much pain, your husband sounds like one of my brother-in-laws he was great when she was waiting on him hand and foot -(maybe thats what head over heels in love means ? LOL) but as soon as the children came along he was a monster - his needs were and are the only ones that exist - when my mum died he wanted us to console him bacause he felt it was like his mum - NOT!
I saw a T shirt once that had "it's all about me" sums him up - my sister left him many times over the years but always went back - (which made me both sad and angry at the same time) it took years before she could leave - hopefully this time for good -
Sex may be important in a relationship where there is love - but i think it should be a mutual thing or its just you fulfilling his needs without him caring what your needs are. (just my opinion though
Maybe he wants to stop therapy because he feels he is not getting the result he wants.......
Take care P7