The Wanted - Warzone Lyrics Meaning

This song is about a boy's girlfriend is cheating on him and he wanted revenge. She hurts his feelings at the first part of the song goes "I can't believe I had to see the girl of my dreams cheating on me." It's saying that his girlfriend is cheating on him. He went up to his girlfriend with her new boyfriend, pushed him down break up with her and walked away. This is the what I think that whole entire song is about.