No, I can dream about revenge when I'm still hot and angry about the thing, but usually I become more reasonable after a good night sleep
That doesn't mean I'm ready to forgive though. Usually I just avoid further contact to the betrayer, and if I'm forced by circumstances not to do so, I remain very cold.
I would never lower myself to do same thing betrayer did, and I dont need to, since the betrayer will find his punishment in his own behaviour...