I can't stand my best friend's boyfriend.
Why do you hate your best friend's bf?
He groped me and snickered when I told my friends about it. He's a horrible person
I understand, that's a really terrible thing he did the. You should tell your friend about that.
I feel like he's trying to abuse my friend.
He sounds abusive overall. Her finding out about this could be the last straw and she most likely will leave them. This would be the best outcome for both of you.