I've recently had a change in outlook that has really helped me deal with my situation. My situation is fairly unique, but I've come to see things differently and I hope my new point of view might be helpful to others on this sub.
First, my situation: I was married for 35 years, and the last 10-15 were pretty bad. My husband was emotionally abusive, constantly belittling me, and gaslighting me. Dead bedroom for the last ten years. But he had a long term illness and I felt that it was my duty to stay with him, and as it progressed, to assist him more and more. Divorce was never on the table.
But I was deeply depressed. I felt that I was disappearing, and that I would never know love again. My sex drive completely tanked, and I had almost no desire for years.
And then I met a man who became first a close friend. It progressed to an emotional affair over six months and then became physical. I love him with my whole heart, and honestly it gave me strength to tolerate my husband's abuse, knowing that I was in fact lovable.
My AP is married, and says his marriage was bad, that he also felt unseen. He says his wife knows about us, but I think that's only partially true. She knows we're friends, and knows he hangs out with me a lot, but I don't think she knows the extent. He says she never asks for more information, even when she knows he's been with me for hours. I am also acquainted with her and have been at social events with the two of them (which is honestly tough for me sometimes). She is cordial to me, but we're not especially friends.
During the first year or so of our affair I felt a sense of desperation, that my AP was a lifeline that was saving me. It was what I needed, but it also opened up my eyes to exactly how terrible my life was with my husband. (And it turned out that my sex drive wasn't extinct after all - it came roaring back!)
Then, late last year my husband unexpectedly passed away. It was related to his illness, but we hadn't expected him to pass at this point. (His illness, which I'd prefer not to mention for privacy reasons, generally lasts for quite a few years but eventually probably would have killed him.)
I've been processing how I feel about my husband's death for the last six months. I'm very conflicted. I feel bad that he died unexpectedly, but I also feel a sense of freedom, which makes me feel a bit guilty. I will hopefully live another 20 or so years, and now I get to live the life I was missing out on.
The thing that surprised me, was that I've also had a shift in how I feel about my AP. I still love him tremendously, but I'm not expecting him to "save" me. I value the time he spends with me, and I love being with him. But if he can't meet up for some reason it no longer sends me into a spiral.
And even more important is that I've made the mental shift that if at some point he decides to focus on his marriage (or if his wife finally tells him to knock it off) I know that it will hurt but I'll be okay.
I've also mentioned to him that at some point in the future I may want to have a relationship that is more complete, that I'd like to have someone who would be a companion that I could go places with. I would like that to be him, but if it's not then I would probably start looking to date other people.
This mental shift has really helped me deal with the situation. I'm no longer desperately looking for a savior, but am now looking at the relationship with AP with more parity. I'm very happy with him now, but if in the future he no longer can be the partner I want, we will part ways.
I realize my situation is unlike most people here, but I think that changing your mental landscape can be done in a lot of situations, and I hope others here find that perspective shift helpful. I think once you really understand that being with your AP is just one of many options, it gives you strength to figure out what you want, and act accordingly.
Just my humble opinion!