What would you do if you get to know that your partner is cheating with you?

Well I would become very aggresive and surely would breakup with him. I would begin to question myself if i was wrong to trust my partner and would wonder how real our relationship was antways. My future dreams and hopes would be shattered but i would take this as a learning experience and try to calm myself down. I can't stand cheaters and if he was really emotionally connected to me, i don't think he would have done such a thing in the first place :-)