From the other side of your coin.
I don't think it will ever go back to whatever normal you had before and you now have to find your new normal.
For me what helped was my wife finally being completely honest about everything with me. After I found out she was in a bit of denial. Didn't deny the affair as that wasn't deniable. She denied certain aspects of it like how long and such.
I think I reacted unusually. I forgave her straight off. Not for her but for me. I didn't want to hate her. But forgiveness and acceptance are vastly different despite often being confused.
I did not accept and we did get to the point of separation. But we were friends still and amicable.
Then I made her laugh. As I always aimed to make her smile always and it broke her. She confessed to everything. Held nothing back and answered any question so she could show me how sorry she was and for the first time I believed her.
We are a while down the road now and here is where its relevant to you.
I haven't gone a day without thinking about what happened. Which is progress from hundreds of times a day living the heartbreak over and over.
But its always there.
There is always the comparison. She never ever has made any comparisons. But I cant help but do so myself.
And it could be anything from physically to how I reacted to a situation. To not liking a certain type of food. The little dark part of your mind just chimes in with a "I wonder if she thinks hes better looking", "I bet he would have just put the shelves up without delaying a day", "I wonder if he would have shared her dinner"
Its unstoppable so far.
Then there is the random thought that pop into my mind about what they did together. Things I actually do not want to know.
Its less frequent now but still there.
What helps is saying when they get too much. I just say that i'm having a really off day with the unwanted thoughts. She understands and either hugs or gives me the space I need depending on what is right.
Something that helps both of us is a promise I made.
I will never, not even once, use the affair in an argument, to get my way or throw it in her face in any way. I want her to feel safe to talk about it and know I do not save ammunition and have no interest in revenge or anything like that.
There are times when its really hard on her. Recently I had to stay away for a few weeks to look after her dad. He has dementia and his with needed an operation that put her out of action for a bit so he asked if I would help him as he was too embarrassed to need help from his daughter for things like going to the loo or getting dressed.
During that time I was staying over every night and only seeing my kids and her briefly during the day.
My wife of course understood why and was thankful but it made her realise what she almost lost. She hated me not being there and said so. She said she was so stupid to have done what she did and selfish for not thinking of my feelings but so incredibly thankful that I am still here.
It really hit home just how close we came.
It does not go away. It will never be the same normal. But it can, if looked at right, be your strength and commitment. Let that part show and let him know too.