She went from a size 16-18 to a size 4 in this period and suddenly found herself attractive to other men for the first time in her life.
One thing led to another, she hooked up with an OM from her work, and here I am now. I think it no coincidence that our trouble began once she completed her weight loss.
I admit I am a bit bitter about this fact.
This sounds pretty much like my sitch, just without the OM. I think she might have been toying with the idea of a EA in the spring/early summer (before she moved out). We had lunch together one day and she told me that a (married!) girlfriend she went out with was meeting another guy and that he seemed more interested in her than in her girlfriend and then he called her a couple of times. The girlfriend got really mad at my W a couple of weeks after that and they are no longer friends. My W said that she needed to tell me all of this to get it off her chest and she wanted me to know about all of this. She also said that she kept thinking what a wonderful friend he would be for me (same interests and everything). He has, since then, met another woman and has a relationship with her. Both him and his girlfriend are still in touch with my W and I met them at the art show that I mentioned a couple of weeks ago. I have to agree with my W that he would be a wonderful friend for me. I do trust what my W has been saying about this situation, 99% sure that nothing went on, but I do think that she might have been tempted because he was such a nice guy. After I met them at the art show, she asked me: Aren't they nice! Wouldn't it be nice to hang out with them? She then told me that if I see a bunch of texts to certain numbers on the phone bill, it's probably them. They are the couple that she wants to go out with together with me.
Even though he is now unavailable, maybe this is still playing some role? Thinking back, she did move out after she met him and she's still in touch with him and his girlfriend. Just don't want to dwell on this as there's nothing I can do about it, but I would like to understand how this could be affecting my sitch.