I have a friend who happens to be a guy...
Anyway he has another friend who happens to be a bisexual man, but my friend is straight... But his bisexual friend keeps hitting on him, often very nasty like... My friend told me he is only friends with this other man because the other man will come up with false charges against him if he stops being his friend, he did that in the past and almost send my friend to jail...

Me and my friend go places together, etc... And when this other man found out, he's calling my friend obscenities and threatening him if he continues going places with me...

This seems really abusive to me... Advice please? I feel sorry for him...