I do understand the feeling of being rejected. It is humiliating and lonely, and it simply hurts. And it didn’t fix it self.
Spot on.
Some people have affairs because of their internal psychological sexual problems.
My FWS was one of those. Her lack of interest and inhibitions around sex, after the initial pregnancy and children, was one of the major marital problems we had. In fact, it was one of the reasons she was able to convince me that she'd not been having an affair. Before children, her sex drive had not been as high as mine but was tolerable.
Then the cheating makes this difficult to understand, and particularly difficult to tolerate in reconciliation. My FWS said to me once, after the affair, but long years before D-Day, "you never want to have sex anywhere but the bedroom". Instantly, that comment was fried into my brain. I'd been rejected in almost every hotel room we'd ever been in, the living room, the kitchen, the spare bedroom, our bedroom, camping, and the list goes on. Literally many hundreds of times, after she got pregnant the first time, to the point that I stopped trying to initiate. I didn't know at that time that she'd had a sexual affair, in our home, in our bed, in our garage, and made out with him in our bathroom, and our kitchen, not to mention all the other places.
20+ years later, 14 years after D-Day, we still have that problem. Because of her issues, we can't really even talk about it.
And it didn’t fix it self.
The partner with the issues around sex has to continually work on this, actively, not passively. It will not go away with time.
Unfortunately, depending upon how troubled your partner is, you may have very few options. My FWS stopped trying to work on this issue after several years of counseling.
My options came down to acceptance, as difficult as that is, or divorce. I won't cheat, I love many things about my FWS, so I treat it as if she had cancer. I wouldn't leave if she had cancer, so I don't leave because she has this problem.
Do, therapy may help, but the partners have to continually work at it.