I've name changed for this.
A good friend of mine is having an affair with a married man.
When I say "affair" that is not right really, the true position is that he calls her up infrequently, takes her out and they have sex. So really should say a good friend of mine is being used by a married man for sex.
He is a very bad man and she is not the only one. He is hurting her badly. I won't post here the details of all the things he has reportedly done but even in terms of infidelity and disrespect for his wife this is off the scale.
Friend is infatuated with him to the extent it is a disease. She says she is in love and to hear her talk about him is quite the thing. It is like listening to a disciple speak of their leader.
She knows it makes her unhappy and from time to time she tries to break it off with him - but history shows that she weakens eventually.
I am tired of seeing her hurt again and again.
Question: is there anything I can do positively to help her get over this and move on? Or should I just accept that she will keep doing it until she dies (probably of broken self-esteem if you can die of that)?