I'm in your shoes right now man, sort of. My fiance left me three and a half weeks ago, and I have same standarts you do, I think that cheating is the end of the line too! And no matter how much I love her, I wouldn't be able to take her back if she did this to me. So far I know she doesn't date anybody but if she does, she won't be able to comeback and I told her that. Once female does something like this she is no longer interrested in you, think about it, why would she kiss and cuddle with someone else if there's you? I had a slightly different situaton, but whenever we were together, things were fine, when we apart, she was a *****, nagging, mad all the time, was taking me apart and tried to sabotage our relationship over any little shit! So, she is your left overs that the other guy got. She has to go.

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...The key is, being bold and gallant. She is looking for the knight on the big white Charger that she reads
about in her stupid romance novels. Remember, after she decides to keep you, she will be throwing
those books in the fireplace, where they belong, while trying to keep you warm!...
Doc. Love