Don’t stand by and watch your friend suffer abuse. Yes, this is classified as abuse, and we need to recognize it as such. Anything a person says in an attempt to belittle and control another person is abusive. Your first job is to help your friend understand that love is not supposed to behave this way, and they should not consider dating anyone who hurts them or thinks so little of them.
The Bible says, “Do not be deceived: Bad company ruins good morals.” An abusive and belittling partner is bad company. Not only is an abusive partner bad company, they are poisonous to your friend’s self-esteem.
If the first step is seeing this type of abuse for what it is, the second step will likely be helping your friend see and embrace that they deserve better than the treatment they are getting.
More than likely your friend will tell you that their partner is not like this all the time. And they probably aren’t. But abusers almost always try to isolate and manipulate their victims. You friend may be fooled by her boyfriend’s charm and attention, but if he has already demonstrated an abusive pattern of behavior, it will only get worse if she continues to allow it.
Helping in these kinds of situations is never easy, but as a good friend you can and should gently and lovingly let her know that she is not alone and that she does not have to take this kind of treatment. She is worth more than that to you and to God.
(adapted from Live Right Now)
 1 Corinthians 15:33 esv