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She probably feels the same

If nobody fell in love with the wrong persons, then these poor souls would never have a chance to be loved...

Love is not selfish.

You're in position of power. If you move on (not too quick though), she will miss you and will have nobody to blame but herself, and she'll feel very bad about it.
Don't feel hurt, she hasn't left...

I am tempted to say that you're the jerk here. You're disrespecting that other guy... and he was in your exact position 2 years ago.
You might be next... who knows... she might also dump you, and...