I really think it's pretty straightforward. He's in love with some girl and the girl is seeing someone else. The guy knows he should just go on, so he hates to be so emotional about this. He beats the other guy up and he's trying to ridicule him at least in his own mind or in his own way.
It never says that he's much better than the other guy and he probably doesn't make any moves towards the girl. He's just trying to get the other guy out off the way somehow and it's probably he's beating the other one up purely in his mind.
Yes, there could be other interpretations of the meaning, but the straightforward thing is this one
I really think it's pretty straightforward. He's in love with some girl and the girl is seeing someone else. The guy knows he should just go on, so he hates to be so emotional about this. He beats the other guy up and he's trying to ridicule him at least in his own mind or in his own way. It never says that he's much better than the other guy and he probably doesn't make any moves towards the girl. He's just trying to get the other guy out off the way somehow and it's probably he's beating the other one up purely in his mind. Yes, there could be other interpretations of the meaning, but the straightforward thing is this one