To answer your question if I think you're crazy? No. Not at all.

The whole door incident was a culmination of the enduring, repeated, unacceptable behaviour that you put up with from her for far too long.

Which is something that I think that you need to have a hard long look at, for your own sake, before you enter another relationship. 99% of men would have left ages ago - she had multiple affairs, was a liar, manipulative, a cheat - the list goes on and on. For your own sake, you didn't need to put up with that for so long - and it would concern me if you entered another relationship and had to endure that kind of treatment, and stuck around, without leaving.

She clearly is emotionally unstable and sounds like she needs a lot of help.

You can hold your head high and walk around confidently that you are so much better than that and you deserve so much better!