Making the decision to leave:

• If you’re hoping your abusive partner will change... The abuse will probably happen again. Abusers have deep emotional and psychological problems. While change is not impossible, it isn’t quick or easy. And change can only happen once your abuser takes full responsibility for his behavior, seeks professional treatment, and stops blaming you, his unhappy childhood, stress, work, his drinking, or his temper.
• If you believe you can help your abuser... It’s only natural that you want to help your partner. You may think you’re the only one who understands him or that it’s your responsibility to fix his problems. But the truth is that by staying and accepting repeated abuse, you’re reinforcing and enabling the abusive behavior. Instead of helping your abuser, you’re perpetuating the problem.
• If your partner has promised to stop the abuse... When facing consequences,abusers often plead for another chance, beg for forgiveness, and promise to change. They may even mean what they say in the moment, but their true goal is to stay in control and keep you from leaving. But most of the time, they quickly return to their abusive behavior once they’ve been forgiven and they’re no longer worried that you’ll leave.
• If your partner is in counseling or a program for batterers... Even if your partner is in counseling, there is no guarantee that he’ll change. Many abusers who go through counseling continue to be violent, abusive, and controlling. If your partner has stopped minimizing the problem or making excuses, that’s a good sign. But you still need to make your decision based on who he is now, not the man you hope he will become.
• If you’re worried about what will happen if you leave... You may be afraid of what your abusive partner will do, where you’ll go, or how you’ll support yourself or your children. But don’t let fear of the unknown keep you in a dangerous, unhealthy situation. 
  
  Information provided by www.helpguide.org , Help for abused and battered women.
  
  These facts can help women make the decision to get out of an abusive relationship. Preventing women from ever getting into the relationship in the first place is hard because they do not know that their partner is abusive until after they get in the relationship.