Relation problem

i have my friend who is a girl she is with a crappy boyfriend the boyfriend is only there for lust and her body .how do i make her realize that he is not good.I know many bad things about him example one day he said it felt really good to touch her legs.Help me ouut as to hwat to do .what do i say to her for her to slowly realize

If you're a true friend, you'll be there for her when she does realize what sort of a guy she's with. Until then, all you can do is watch it because your friend is the one who is responsible for herself and her actions and nobody else, including you, has a say in the matter.