It is different for everyone. I'm just over 2 months on from him giving up the OW (and he kept up the 'romance' for 6 weeks after he told me about it.... which hurt beyond anything I could imagine).
I was never angry with him, or her, just sad, so have no anger to let go off. As for forgiveness, I don't feel the need to forgive or not forgive iyswim. I never stopped loving him, but my eyes were opened to his faults, and I lost my desperation to 'keep' him. He came back because he wanted to, not because I begged him, which puts us in a fairly neutral place. No rules, no ties, either of us could walk at any minute, and the fact that we haven't says a lot.
We half live together - I am in the house, he is in a flat, but he is effectively with me most of the time. He cooks for himself, washes his own clothes, and does his own cleaning. One of the problems in our marriage was he treated the house like a doss house with magic pixies on hand to clean up after him. I cannot live in filth, so I admit I did do everything. I will never do that again.
Our relationship is very different now, more equal. I still couldn't tell you whether we will stay the distance, BUT we will always be good friends and very close. There is no blame or hate on either side, and I am bizarrely much happier than I have been in years. I feel like I can't lose. Either our marriage will work, or I will walk away confident and independent, with a positive outlook on life.
His affair scarred our marriage, but I would not go back in time and change what happened. I am sorry the OW got hurt, as he promised her the earth and delivered nothing. She was 11 years younger, and a bit in thrall to him. It wasn't fair to do that. I hope she has learnt a lesson in life though. His affair meant I found 'me' again. So many women feel they lose who they are after they get married and take on the role of wife, housekeeper, mother etc. I am who I was before I got married again, and I liked that person better than the one I turned into. I'd hazard a guess my DH likes that person better too.
Good luck. You will get through the misery. 6 days in I was destroyed, utterly bereft. I had good friends though, who held my hand through it and helped so much. Don't fee you have to keep everything to yourself, talk to your friends. It does help.