I'm sorry he's being so awful inthedusk You deserve better and I guess what you're saying is that you are trying to work out how to teach yourself to believe that! We can all see that you are worth more.
It's dead easy to sit on a keyboard and tell you what to say or do. It's not so easy when it's your life. I bet you half of us wouldn't find it so easy to LTB or tell him this or that.
However - what does the future look like for you if you don't? Are you going to be with a man who fell in love/attraction with someone else, and wasn't even sorry enough to give up contact with her? Who respected you so little? Who treats you like a nagging mother not an equal who deserves partnership and honesty.
I've noticed a few threads where you've said he makes breakfast in bed, hoovers, cooks the tea etc as his signs that he's trying hard, and I'm afraid this just stays in the nagging mother/child parameters. Firstly, why shouldn't he do all those things anyway, when you are equal partners running a home?, and secondly, those things do not cancel out the other, less practical, more emotional things he owes you.
If you are going to move forward together, you HAVE to be able to talk to each other about whatever is on your minds, whenever it is on your mind. Even if it's going to cause a blazing row, or you've said it all before, or you have a 'certain look on your face'. You just have to. If you don't think you can talk to him, that's just the end.
I wish I could make you see that his response is so, so wrong. Even going to bed early is wrong. He should be doing everything in his power to make you feel loved, respected, desired and cherished, after the way he has behaved.
Unfortunately, by saying you'd leave if he didn't stop the lessons, and then not leaving, you have effectively given him permission to do whatever the hell he wants.
Are you sure he hasn't got another (PAYG) phone that you don't know about?
Finally, there's a phrase that partners of addicts are often taught, but I think it's useful in a wider context for other difficult behaviours - it's worth remembering that you didn't cause this, and you can't control his behaviour, and you can't fix it on your own.