Hi Operculum
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I can relate in a reverse fashion.
At one time I was the annoying 11yr old, my mother was in a relationship with a man that started to want different things out of life and she was unaccepting of this to the point that she was blinded to getting on with her own. I don't judge him/her anymore, and he was a decent man to start out with but because he was unhappy and I can only guess that he felt trapped and obligated, he turned into a prick and started to do things that affected everyone negatively. My point is that by moving on, you will be doing everyone a favor, not just yourself, she also deserves a good life for herself and her kid and that won't happen if you turn resentful and bitter.
Don't take this as judgy, and I respect you for sharing something that could be viewed as selfish, actually in all reality its very honest and not selfish.
Good luck
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