Why do some guys break things in anger?

Alright, I've been in a relationship with my boyfriend for nearly a year. We of course (like all couples) have fights. But..there has been a couple times where his anger has increased and he's punched a wall...or like kicked a table..breaking something. -_- It's annoying..and scary sometimes. He would neeeevvvverr hit me. He babies me way too much. And I have a few friends that have the same issue with their husbands or boyfriends. Can someone explain? lol He is 20 years old by the way.
Why do some guys break things in anger?
Post Opinion