Has a friend of yours ever told you that she thought her husband was cheating on her and she didn't know how to get out of it. Here is a way to get to her to leave him
Sit down and talk to her about her situation and what she wants to do.
Step2
Give her advice but don't put too much of your opinion into it.
Step3
Take her out so her husband is off her mind.
Step4
Take her to relaxed places where other men are in order to show her other men are interested in her.
Step5
It is up to her to make the decision whether to stay with her husband or to realize that there are better men out there. As long as you give your advice, and show her there are better men, the likelihood of her leaving her husband for someone better is very high