I hear you, Hollowed. I was there a month and a half ago and its an unpleasant place to be - I think that this is something that is going to take time for you to process on a level that is beneath just thinking. Do you think you could consciously make a decision to compartmentalize these thoughts so they don't interfere with your important work? Your brain will deal with them in time, but really its just information - no urgent threat to your existence. They aren't responsible for your happiness or well being.
One thing I will say, is that you don't know how effortless this is for her. None of us can be inside her head, and she can be putting on a very smooth facade but inside it is probably a lot more stormy. Sometimes those storms run deep inside and they aren't even aware of it for a while.. The fact is, none of us are mind readers - sometimes when we think we are, we can end up making things a lot worse for ourselves and others. I know that is true for me, at least.
it's not easy at all. Been trying to keep myself busy so I don't think about it but hard not too. I'm trying to take things one day at a time as hard as it is to do.
One thing I know is that there will come a day she is going to regret what she has done I have no doubts about that. Big question is if I will still be there to catch her when she falls. She tends to do that stuff a lot. Do something and then later regret it. I think right now she's too caught up in this other guy to even really take a look back. If there's one thing I know about my wife it's that she falls "in love" quickly.