cheating husband

This is a topic that I'm looking to give advice to my friend on. So I have a friend who has been married since 19 her husband has cheated on her several times and walked out and left her with the kids. She's taken him back everytime. Well recently he cheated and this time he has a 7 month old and second child on the way with girl he cheated with.. I understand that she is upset and her feelings are hurt but I told her she should not go about it the way she is. She has the girl number and calls her private all the though the night and stalks her on fb and any other social media. I told her personally if it were me I would get a divorce and move on. She feels if she gets a divorce then she is letting the other girl win. She is so bitter all she does is send pics of the baby to her husband and tell him I you want to be with them but your not going to move on and be happy. Now she did tell me that her husband asked for a divorce because he wants to move on. What else should I say Ive tired to help her several times.