maybe sophia ought to create a "would you ever cheat on someone / justify cheating on someone" type thread.
As for me, I would freak out and suddenly go deaf, dumb, and blind, and then I would be abused by my crazy uncle and become a rock legend. Oh wait, that was Tommy, by The Who. Been so long since I saw that movie, plus I think it was murder he saw. Get that confused sometimes.
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Its hard to say what I would do. If I walked in on them, I'd make some remark about her being a **** and him being someone who sleeps with another mans girl and ask him to leave. If I noticed it happening by overhearing them, then I wouldn't barge in, Id first go find a camera or video recorder of some kind. I would probably let them finish and say nothing. Then a few days later I would casually leave a computer on having secretly uploaded the video to a porn site. I'd have it set to repeat or something, she would find it, and probably realize that I knew, and probably suspect I recorded it, although its hypothetically possible someone else, esp if I went to a window or something. I might also try and blackmail the guy, depending on whether I knew him or he was just some guy. If it was a friend, then anonymous blackmail, ask for x amount of money posing as a third party or else I show it to myself and ruin the friendship. If he doesn't care if I find out then yeah maybe I will start **** or do something else. If the friendship is worth nothing to him, then it's worth nothing to me either.
Now depending on what she does from there, confront me, or keep silent. If I get the silent treatment I become somewhat demanding. This will gauge whether shes a total bitch or riddled with guilt and trying to be kind to me. Where-ever we go, I wouldn't be protective at all. If we went to a club or something and people be hitting on her, I'd react like she were just some **** there with me. It goes without saying that an element of trust is betrayed, but I'm not the sort that will try and demand she don't fool around. You really have two separate issues here, lust and betrayal of trust.
Where things go from there, it's hard to say, depends on if she really cared. Its also an entiretly different matter to screw someone vs being in love with them. I wouldn't tolerate latter until any circumstance and probably react with far more devastating sneakiness. Nor would I go through some episode in hopes of acting like it never happened. Once a cheater, always a cheater. She would forever be a **** wife in my eyes, regardless of whether she stopped or continued, and I'd suspect she were doing things in secret anyway. I'd remind her the position is sinful (spiritual values) but I'm not going to get sucked into divorce and adultery (new relationships) because of her sin. I'm unlike to be the one who actually ends / abandons a relationship, that to me is even more devastating, but it really depends on whether there is any love or not, plus I would take some kind of leverage in exchange for such tolerance on my part. I imagine things would get pretty kinky from there.
Usually, a sexual betrayal comes either out of a moment of weakness or an intentional move because one is not happy in a relationship and chooses to handle it in the wrong way. If the issue was the result of the latter, then yeah probably it would be over.