I think it is not totally wrong for you to look back and see what your missteps were in the M. But you are not the only one to blame. He has his fair share also, don’t forget that. I agree with what Steve said, whatever you did wrong, is no justification for his behavior. Yes, he is hurt....but so are you. Take care of yourself first before thinking about his pain.
About the ring- my H doesn’t wear his. I was so angry after BD so I took it off. Then later he threw a tantrum about me taking my ring off, saying that it was the only little hope he had left of our M (which was totally nuts because he still did not have his ring on). Anyways, later I decided to put it back on not for him, but because I’m choosing to stand for our M and I am still married. (Plus it’s pretty). Don’t worry about what your H thinks. You do things for YOU.