If breaking up with the abuser will cause all their friends to leave, or to also get violent, then they need a support network.
They will not want to be alone, so it is necessary to find or help create a support network in the community for these situations.
Dating Violence is the use of harassing, controlling, and/or abusive behavior to maintain power and control over a partner in a romantic relationship.

His/her control over you limits your personal freedom.
There’s a fine line between expressing an opinion and requiring a person to act or do certain things.
It can happen whether you are young or old, and in heterosexual or same-sex relationships.
Dating violence is always wrong, and you can get help.
Dating violence happens to people of all races, cultures, incomes, and education levels.
It can happen on a first date, or when you are deeply in love.
Telling the difference between an opinion and abusive behavior might seem easy, but sometimes it can be more difficult to interpret.
Abusive behavior follows a pattern; it happens frequently and is meant to make you question your own thoughts and feelings. You may feel that you have to do things his/her way in order to keep the peace.
Sometimes it can be due to background, bad examples, or even illness.