I found out my girlfriend of two years was cheating on me with a bunch…

I found out my girlfriend of two years was cheating on me with a bunch of guys at school. I feel a raging, nearly demonic fury. I can hardly talk; I just growl, I broke a cell phone yesterday, and every time I try to get the pain "off" by exercise or going to work, it just "boils" that much harder. I grabbed my TV and nearly hurled it out of my window last night. Cliche, but I feel like a monser.