And after the long talk I'd break up with him.

^THIS! AHAH :)

This has happened to me. It was the end. It's something very hard to forget.

It happened to me and I didn't say anything at first, I just slowly manipulated him to confess and I made him feel twice as giulty as he should feel, then turned into a psycho girlfriend and broke up with him.

^Ah ah love the option Ale :)

Anyway, I would confront him, have a long talk, speak my mind and break up with him and probably prepare a revenge or make him regret because I'm way to revengfull!

I was cheated on when i was younger and i basically got all my anger out in private - cried for a few minutes, yelled and punched my pillow, and then i told myself, "Fuck this, I'm too good for his ass anyways!" I waited until i saw him and the girl he cheated with, who was SUPPOSEDLY one of my friends, and i just walked straight up to them with a smile on my face and told them, "I know about you guys going around behind my back, just because i missed a day of school doesn't mean i missed out on all the action! I hope you guys are happy together. Oh and hun, don't come crying to me next time you're all upset about some bullshit and need someone to comfort you because i damn sure won't be there for you."

And uhhh.... i slapped her across the face, punched him straight in the jaw, and walked away.