I think the key problem with all of this situation is that I am not ready/able to let go of this marriage until I know I've got peace of mind over how I'm feeling. His current behaviour is pushing me away (and mine is for him), but if we give up now, I'll feel like we gave up before the storm passed, and won't feel like I've had any closure on it.
What would "peace of mind over how you're feeling" mean?
It sounds like you want things between you to be in a calm, relaxed state with no anger/control/pressure, and for you then to be able to step back, look at the relationship and say - this isn't what I want. And then you'll feel leaving is justifiable?
But the reason it's not what you want is because you've never been in that state, not really, from all you've written. It was similar in one of your older posts, asking can a relationship "get back to" a good place, from such a situation as yours. But it sounds like your relationship has always had major problems, as a result of your H's behaviour?
Sorry I hope it doesn't sound like I'm attempting to tell you what your relationship is like! But this is what you wrote at the start of your original thread:
DH has always had a nasty temper, I've suggested anger management counselling numerous times but to no avail. The last few years since having my child have been really difficult. He's generally spoken to me with contempt and disdain a lot of the time, with occasional temper flashes, arguments are always toxic, things could get very nasty (never physical). On a day to day basis we would be civil enough to eachother, but nasty looks and snappiness from him were definitely daily as well, with bigger flare ups fairly regularly. We have had happy family times too and we both dote on our child.
If you "get back" to that situation, are you going to feel differently? Because that situation is what drove you to have an affair.
So really you are relying on the fact that your H has truly had a road-to-Damascas moment, and all his work on himself will result in a changed man, and you'll wake up one morning and discover you're married to a new person. But a) given all you've said, he's certainly not fundamentally changed much over the last 2 months, and b) If he miraculously does change, how do you know that this New Husband will be able to give you what you want or need in a marriage anyway? Is he going to also have a personality transplant so that you have the same sense of humour, he knows how to comfort you when you're sad? Will you start to actually like him?? Because ultimately it sounds like he needs to be a fundamentally different person, for the rest of his life, for you to be happy (again, why you had an affair).
But, I don't see how things are going to improve. He needs love and affection to move forward, I cannot give him that, I need time and mental space, he cannot give me that.
I agree.