reasons to step in and help when a friend is getting abused

i would say it depends as to how you know your friends, cause stepping in a relationship is like mixing your salad with bread so you need to blend, and when we say blending it means making a pleasing combination. when a friendship is mixed,trust and honesty are there so friends with this kind of relationship need not to be told that a friend needs help

It is hard just to sit back and do nothing when a friend is being abused. You need to help in any way you can. Your friend might not appreciate your interference at first, but it might be what they need to save their life.

What do you mean you need a reason to help? Just knowing that your friend is being hurt should be more than enough reason to do something about it. It's better to intervene now, than wait until your friend becomes just another one of those unfortunate lot you hear and read about in the news.