Think it through, love. Men aren't divided into shitbags and non-shitbags. People who have affairs lie. That's how they're having affairs. He's already a lying shitbag. You just thought it wasn't to you. Well, surprise surprise, he has been lying to you. Managing you. Manipulating you. I'm not saying about everything, but enough, enough to get you seriously to wait around for a man you feel passionately about who is 'going to leave his wife' sigh. (no you feel passionately about the affair. You have no idea if you would feel passionately about him in a real relationship which is totally different.)
Why would he not want him leaving her to be about you anyway? If he was actually going to leave her, what would it matter? If he was actually going to leave her it would be better for it to be about the affair because she could get angry and the split could be acrimonious but clear. Even if he ever were to leave her, he wants to do it in a way that makes it look like IT WASN'T HIS FAULT. then what? He gets together with you and somehow maintains that it wasnt actually about you? Bitch, please. So wants it to be 'amicable'. He wants it not to be about you. Even if he were to leave her, which he isn't, OP, why would he, the manner in which he's prepared to leave suggests a coward who wants to hide you and stay on intimate terms with his ex wife. Whoop for you.
Seriously. Stop. And stop projecting on her stuff you know nothing about. HE has manipulated both of you to stay in the boxes he wants you to be in. You can't understand HER behavior? seriously dude, who's got the house, the man, the life, the money, the shared parenting, the holidays, the vast amount of time with him? What about your behavior? What sort of mindset is it that judges a man on how he's treating his wife when she is treating that woman in the same way too? Wake. Up. You are not a bystander. You are doing this. you are torturing her too. just as he is torturing you. He will not leave while he has no reason to go. Start your life, OP. Start your life. As soon as you are strong and happy, I promise he will turn up on your doorstep saying he has left and that he misses you. And then. When things are crumbling and your new independence and strength eroding and you're moulding yourself round him again, then he will go back. What we want is to be loved and to feel important to people and not to lose them. And we'll destroy them to get it if we have to. Stop.