Thanks for the responses and feedback. I will do my best to answer as much as possible, and offer a bit of my own thinking.
To the suggestion of punching him in the face, of course that crossed my mind but there are a couple problems with it. First and foremost, I have already had an assault charge that I had to deal with once. Fighting is stupid and is almost never the answer. Two, being in a wheelchair I realize there isn't a whole lot of fighting I could do anyway.
As to the open relationship. Short answer, no way. It was something I contemplated but there is simply no way I could stomach it, and I don't think she is the kind of person that would deal well with it either.
To Haast's point about trust. That is the number one thing staring me in the face right now. I don't see how that trust ever gets earned back. I mean I suppose it is possible, and I don't think we would be the first couple in the history of the world to overcome something like this. But as it stands right now, I have a really hard time seeing it. I have no desire to spend the rest of my life questioning every time she gets a message, or feeling like I need to look through her phone to see if she is being honest. I feel dirty that I did that in the first place.
So here are some of my thoughts and why I still hold on to some sort of hope. It may simply be because I am trying to rationalize it all and put a happy spin on it. I really don't know, but hear me out. If it is all about sex, why not just go find someone to have sex with? She doesn't even actually see this guy, so there was clearly more going on than just the physical part. Who knows, maybe just the thought of being with someone who isn't disabled painted a pretty picture in her head and she let it get out of control. I think a lot of people do that, and it is the whole grass isn't always greener situation. Just because you suddenly are with someone who can have normal sex, that means everything else falls into place too? I just think if that really is it, she is putting a lot of stock into one very small aspect of life, that in my opinion would never be worth breaking up a family over. Shit I haven't had an orgasm in 11 years, she gets one every time we have "sex", and I managed to survive.