I'm sorry OP, you sound so worn down by it. There's no cure, no 'pill' and, in my opinion, no point either.
People go on about 'putting in the work'. Well, that's not something that a cheated on partner should ever have to do. It's akin to being the one (rather than the cheater) to tell the OW/OM to back off. The person who cheated has already written off their primary relationship and there's no comeback from that.
Some people say that they can rebuild their marriages to former levels, some even say that it's better than it was before. It may or may not be true but it really doesn't ring true to me, it sounds like a peal of desperation to believe it and get other people complicit to believe it. It's a horrendous situation to find yourself in.
I've been on both sides. I was the cheated-on partner (I left but not without 'trying') and once, the OW.
I truly don't understand the mental hoops that some women (and it is always women, sadly) jump through, the lies/half-truths that they tell themselves to make it possible to believe the fallacy of what they believe their partner is/was, and the 'deals' they have to make with themselves to carry on with what is now 'not real'. I've done it myself, tried to make it work but fortunately, not for long. I would never, ever do that again.
I don't believe that the cheated on partner keeps going for love, I believe it's from despair/desperation to 'make it work' and not be seen to fail - or to lose out to the person their partner has their eye on.
I also see a parallel with the scenario when affair partners get together after wrecking their relationships their new relationship starts on the backfoot, so will yours and there's just no way around it. The only difference is that people will not openly critique you as they do OW/OM; they will just feel pity for you.
My advice OP? Run. Don't look back. You deserve a hell of a lot better and I don't think your heart will ever be at peace with this, however hard you try.