How to get my boyfriend to stop being aggressive?

How do I get my boyfriend to stop being aggressive? he never listens to me when I tell him to stop.

like how is he aggressive? anger problems? while doing thee nasty? what?

is he like sexually agressive, like he gets rough w. you when kissing? if he wont listen 2 u, this may evolve into rape. you need 2 sit down and have a serious talk with him. if he wont stop, you need 2 break up with him.

At school, he'll just grab me. recently, he grabbed me by the wrist and twisted it, and hurt REALLY bad. and I told him he hurt me and he doesnt realize what he thinks doesnt hurt, actually does hurt me.

This is just downright unacceptable behavior. You need to have a talk with him, even if you are scared. Step up and make him listen. If he cant compromise with your feelings, then you need to get out of that relationship.
Abuse does not constitute love
you dont want these minor agressive behaviors build up.
couples are suppose to have an understanding of each other

hun this is serious you need to talk to him and make sure if you do it in person you have a friend with you because he could hurt you badly and thats not good if its on the phone three w ay him with a friend. either way you need to have a friend with you. tell him that he is hurting you and that he needs to understand that. if he doesnt listen you need to break up with him.

By breaking up.