I agree with a lot of that POM, though while I agree she did not deserve to lose her memory, I could see Hook feeling like she was supporting the monster and deserved what she got for choosing him, bit of mobster wife syndrome. I would like to see that he regrets that act eventually though, because Belle did not support Rumple’s evil ways and in fact, was encouraging Rumple to be better, which Hook should have seen. Though in Hook’s defense, its hard to really register subtleties like this when he was being beaten with a cane.
Anyway, I think Hook might come to realize he made a mistake with Belle, as he feels he is changing with Emma, and then realize the parallel there and regret his actions with Belle, Hopper and others.
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass