Girls,
to reiterate PP "One thing is for sure, I am not the same person, I've changed and he needs to change himself and understand who is this person who surfaced and was willing to risk it all an ultimately what brought into his life, what gap it filled and is that gap now gone?",
I think this is important. Many things make you change, just growing up, child birth, illness, accidents, decease, One hears the expression "older & wiser", actually its more like a changing skin to fit the new circumstances
You will never be the same person again, the wandering partner will have to adapt to this new persona,& indeed may discover may not like this new changed "you.
It (the affair) will never just go away, & all this "moving on", "forgive & forget" is not realistic. It is something you have experienced, you cannot rewind. You can learn, if you wish, to live with it.
Also, on a conciliatory note, there are many possibilities, separating & finding a lovely new partner, or remaining single, but the crux of it is "how do you see your future "? do you want to see if the grass is greener, or do you want to adapt & grow ?
At the moment, primarily you want it to stop hurting. & that includes recognising that you are irrevocably changed, & must live in that new skin.