namechanges, it's interesting that you say you didn't mind when you were insecure - it sounds as though you are waking up and becoming more aware of what you need and deserve in a relationship.
I can only reassure you that it IS vital to have affection in a relationship - and if you aren't getting it, you will eventually have to leave if you want to be happy.
you only live once, you dont need to be unhappy - perhaps you and him are not compatible now that you are more alert to your own needs and more certain that you can demand them.
He is choosing his own responses in life - people change enormous things about themselves! People go to therapy, take themselves to pieces in order to change -people give up heroin/ drink/ violence - we all go through so many changes as we grow as individuals. ANd he is here, telling you he 'can't' show you more affection.
He knows it's vital to you - but isn't prepared to try.
The truth is, he doesn't want to change - or he isn't ready to. But he is choosing not to at this moment.
If he really doesn't want to try - then, despite the counselling, he can't be the man you need him to be.
Don't feel that you are asking to much, you are not. You are entitled to have love and affection in your life.