How should I proceed now? Is there hope?

[soleil]

I'm not a mind-reader, I couldn't know what he wasn't telling me.I seem to be laying the blame, but in fact I've always said to him that I see my failings and am willing and able to work on them

Ding ding ding.
Sorry to hear about the MC. But on the upside, at least it was clear what his intentions were from the get-go at MC (no matter how cruel) instead of finding out months later of MCing.

However, my confidence as a woman was largely based on his love for me; it has taken such a beating that it's very fragile.

Can very much relate. But right now you need to focus on YOU. Not him and how less than he makes you feel due to this ordeal. Keep your head up!