That is a rough situation. I have been there, I think we all have. This is something that you have to think about first before even thinking about letting them know that you are not down with their girlfriend or boyfriend. Does your friend like this person? Obviously they do at least a little if they are dating. How much does your friend like them? Is this a serious thing or just a casual fling?

Fun flings are nothing to be alarmed about, let them have their fun. If your friend is looking to be with this person for the long haul...think about what it is that really bothers you about this person? Try to put it in one of these categories:

1. Something that you just don't like about them. (Voice, style, some personality trait)

2. You don't like the way that they treat your friend.

If you are finding yourself answering to 1...here's my advice. Let it go! You are not with them, your friend is. If you cherish your friendship you will try to get to know that person and understand how much your friend likes them..

If you don't like the way they treat your friend, this is a problem! Let your friend know that you want to hang out, go to dinner, or whatever. The way to tactfully tell them is to just be honest. Not rude...honest! It might go down like this, "I wanted to talk to you about your girlfriend/boyfriend. I don't like the way that they treat you. I support you and I want you to be happy. Are you happy?"

This shows your love and support for your friend, after-all that's what this is about, right? Here's some caution. Your friend is probably not going to receive this as fantastic news. You have to be open to the possibility that they are happy, and want to be in this relationship. In this case...you support your friend, because they are happy. Think about how you would feel if the shoe was on the other foot. I would not tell them that you hate the person that they are with. You are only pushing your friend away possibly right into the person's arms that you were trying to protect them from.

Above all, love and support your friends for who they are. This is not your girlfriend or boyfriend, and if they are happy, you should be happy for them too.