Here are a few sure signs to answer your question.

An abusive boyfriend may

1. Be quick to say I love you: Some people would question why that is a bad thing. An abusive person uses that phrase to keep you hooked.
2. Makes you feel always tense and under pressure: When you are terrified by the way he’d react to something or you are nervous when your friends and family are around because they could possibly say something to set him off then this is a sign that he has a terrorizing temper. The job of an abusive man is to lower your self-esteem, to lower your confidence, and to blame everything on you. He’ll tell you it’s your fault that he is beating you or verbally abusive.
3. Control you through his emotions: Abuse is not always physical, sexual, or verbal, although those elements may also be involved. An abusive boyfriend may pout when you’ve upset him, he may check your cell phone, go through your purse, follow you or continuously question you on your whereabouts because of his insecurities.
4. Feels entitled to be treated like a king: He goes through life feeling like he can do what he wants. He tries to justify every bad thing that he does. It gets to the point that you start believing that you don’t deserve him which will further his sense of entitlement and his control. You begin to accept and feel that you deserve his bizarre treatment and punishment.
5. Have a bad reputation: Pay attention to the type of friends that he keeps. Are his friends aggressive or abusive? The behavior of a man’s friends reflects his own personality traits and characteristics. If you hear horror stories from previous girlfriends or just former friends then PAY ATTENTION! Beware of facts.
6. Not want to break up: If you finally see the light, then decide to break up and he suddenly goes back to being the nice person he was when you first got together. He might say things like, “I can’t live without you, marry me, and I promise to change, or just give me one more chance.” He’ll tell you how important you are to him and that he loves you so much. This may last for a while but as soon as he knows that he has you hooked then he’ll revert back to the same abusive person that he is.
7. Be rough with you: Physical abuse does not always start off with a punch in the face; it could be more subtle like pulling your arm or roughly grabbing your chin with his hand. The abuse may start off slowly before the punching and kicking takes place, but just remember if he does it once he’ll probably do it again.

If your boyfriend exhibits any of these red flags then RUN. Don’t stay because you think you can change him or because he promised that he’d never do it again. Save yourself the pain and get out!