one of my closest mates is dating this girl that is definitely not right for him. she's arrogant and she dates other people behind others back. I know he loves her but I don't want him to get hurt. I know because I have seen it that she's trying to get with this other guy. I just feel so bad for my mate. I don't know whether I should tell him to move on or act all fine about this relationship but i cant wait just for him to get hurt. i know she will hurt him. She's tried to get with every guy I know but it's hard because you want to do something but I don't know what. he doesn't see her the way other people see her because yet he hasn't been hurt and the girl he is 'dating' has already told people she doesn't like him. I really don't want to cause problems with me and him though. what should I do?