I am 4 years post DHs affair, we are still together. I am mostly happy now but it was a hard path to get there.
It took, and continues to take a lot. For the first six months I believed we were over, financially though I did not feel I could afford to leave. So I stayed, to build up money to go.
I was eaten with jealousy, shame, anger, pain I could physically feel in my chest, fear, loathing for him, her and anyone associated with her.
I felt shame too, for staying... Like everyone who knew judged me as a weak doormat. I hated him and how he destroyed me. I had months of therapy. Two years later, those feelings resurfaced after a relatively good period, and I cracked up and went back to therapy again.
A year ago I was acting recklessly, flirting with other men. Found two that I came close to screwing. Hot, younger men. I found that knowing I could soothed my ego.
It took me ages to understand the reason for his affair. It was the classic cliche of him wanting escape and to feel attractive. We had gone through an awful trauma (I won't detail, as it is revealing), he had suffered dreadfully and then a tonne of other shit came on top of us. I am not giving excuses for him, just saying what was happening at the time. I wasn't a bad wife, I was a great wife, partner, carer avd friend to him. What he did was not my fault. I know and believe that. I also believe that the woman he went with could have been anyone. He didn't care about her, who she was, what she looked like. She was in the right place at the right time and wanted him. She told me, after I found out, that she saw him, liked him and went for it.
Despite this, we are still together. We have a good relationship. The trust is damaged and most days I can live with that, but there remain days I hurt and cry. They flare up without warning. Mostly I stay quiet, the other day I didn't and it spilled out. He listened, hated hearing it, struggled to not show his resentment of me dragging up the past.
I think what I am saying is, in some cases you can stay after an affair, and like us, have a good, healthy relationship eventually. But, the pain doesn't go away entirely. There are days you want to go through his phone. I drove myself mad for three months doing that. Got him to change all his passwords in the end. There are days when you think you hate him. There are hours spent looking her up on social media and torturing yourself with comparison. However, as long as you both understand there will be those times, littered amongst the good moments you are both trying to create, and you but more importantly he, accepts that these ugly ghosts will haunt and show themselves, and you can both work on that, then you can push through.
It won't be sunsets and rainbows, but it can be what you make it.