My sister has been dating this guy for a month now and I've honestly never liked him. We used to be friends until all the sudden he just took an interest in my sister. He's real smooth operator I guess you could call him. My sister did tell me that he talks to a lot of girls but he said he likes her the most which is why he only dates her. Well I saw him at the movies with another girl kissing. So I know that he was full of it. I just don't know how to tell my sister because she thinks I just want her to break up with him because I don't like her and she might refuse to believe me.
Help please?
Concerned brother