I know this is going to sound like the typical male response, so be it, I guess I'm a typical male
It doesnt matter who did what to who, or who's "fault" it was that you two broke up. What matters is that he is handling it like a child, letting his emotions dictate his words and actions regarding the relationship. You could explain it away by saying its a coping mechanism, or his ego cant handle it, or what ever. But when it comes right down to it, he needs to grow up, and stop acting like a bitch. We have all been hurt before, some people stand up and take it in stride, others crumble. If he is the type to fall apart over shit like this, your better off just taking the blame, and moving on.
My gf of 5 years broke up with me a few months back, and we had a similar situation. She said it was my fault for not wanting to fully commit, I said it was her fault for treating me like shit. After having that conversation 5-10 times, we both decided it just didnt matter anymore, and we didnt belong together.
I hope it all works out and you get past this without too much stress, sorry if the response was a little harsh.