How do I become friends with my best friend's girlfriend?

Maybe you should add her on aim or something. Girls love it when guys go to effort about something. also tell your friend ow your feeling. Just say were not spending as much time together as we used to anymore, he should get it.

First of all, you should try to talk to him about it (without his girlfriend) and be sure he understands that it's not a jealousy situation. The"third-wheel"feeling will continue unless they breakup or at least until you find your special someone. Unfortunately, that's what happens when you get close to someone of the opposite sex and they or you begin to date.Hopefully, his girlfriend isn't insecure and doesn't see you as a threat to their relationship. If so, this will be more difficult. However, if all is well, she should also want to become friends with you simply because you are his friend. Ask her if she'd like to go out one day (shopping, movies, etc.) and see how she responds. This will give you an idea of what type (if any) of relationship she wants to have with you.Good luck in this situation and I hope it all works out for the best.