I stayed. Initially I think I stayed because I was just paralysed with the sheer shock of it. It didn’t go on for as long as you describe op and it didn’t go as far physically, but it went fucking far enough. Double betrayal too since she was supposed to be my “friend”.
The first 3 months I was a total basket case, couldn’t eat, couldn’t sleep, dropped a fuck ton of weight, but dh got with the program quite quickly. He dropped her like a sack of shit, no mooning around over her and booked himself into therapy, which he still attends now.
Initially (and this is very, very common) he did make some attempts to shift responsibility onto me. I was “ignoring him” not paying him enough attention etc. total crock of shit. After about 3 months I came out of the initial shock phase and I have to say, I came out swinging. I was fucking furious. I literally ROARED with rage at him, I have never experienced visceral anger like it. I pointed out what a selfish, entitled, revolting shithead he was and that no, none of this was anything to do with me. He took it all and agreed.
The problem was though, as much as I could say it was nothing to do with me, it didn’t feel like it. I felt like I was responsible, like I wasn’t good enough, like I had failed. Therapy helped me with that. I was able to internalise the fact that it was nothing to do with me and with that came a sense of peace and calm. I gave all the shame and all the guilt and all the responsibility back to him, where it belongs.
He worked really hard in therapy to unpick why he chose ( and yes it was a choice, I will not countenance any suggestion of a “mistake”) to do this. He had a shitty childhood, which, whilst in absolutely no way excuses what he did, does go some way towards explaining why he was so self destructive,
It is almost 4 years ago now and whilst things are in no way perfect, they are definitely heading in the right direction. We moved away which helped, and dh continues to take full responsibility and not rug sweep or expect me to be “over it”
I do still love him but this has completely changed the dynamic of our relationship and actually, not in a bad way. Prior to this I had him on some kind of misplaced pedestal, but that is definitely gone now and we are better for it.
I do not worry about him doing it again, I don’t actually think he will. But I don’t police him or his movements/ phone etc simply because if he chooses to do it again, that is on him. I survived the first time and if he does it again, I will survive that too. What I will not do and he knows this quite clearly, is ever give him another chance. He is on a final written warning and he knows it and behaves accordingly.
Will it all work out? Who knows. I think so and for now, I’m glad I stayed but I reserve the right to change my mind at any time, which I think would only happen if I got even the slightest whiff of inappropriate behaviour.
Sorry for the massive essay! In summary, IF your dh does the work op it might be possible for you to work through it. But only you will know that and you will reach a point where you decide to stay or go. Give it time if he is doing the work and put yourself first. It will become clear what the best option is for you. Good luck xx