I'm so mad at my roommate that I'm going to break his new computer monitor.
Why would you break his things? Did he do something to you?
Yes he's always damaging my things and I can't take it anymore.
It is wrong to destroy other peoples property. If you have a problem you can move out or tell them when they are harming you.
He doesn't listen to anything I say. The only thing he'll notice is seeing his things damaged.
You really shouldn't break your roommate's property as a form of retribution. It sounds like this is a frustrating situation for you and it might be best if you look for a new living situation. I think you'll be happier living with a new roommate.