Cheater ! Killer ! Dont , Girl Freind. Not Female -Alien?

First of all, who did you hear this from? If it was from someone who is trustworthy, you should then confront your girlfriend and best friend and tell them what you heard, if they admit to this, you have no choice but to dump both of them. How would you ever be able to trust either of them again? Your girlfreind couldn't have cared very much about you,if she could cheat on you with your best friend and likewise, what kind of friend could this person be,if he could do this to you? But first,you definitely have to make sure that what you heard is true,or else you could be risking your relationship with both these people and take the chance that they would never forgive you for this.

I think that you should find out the facts first. Just because someone said it's happening doesn't mean it's true.I would really look into it first before making a decision just in case it's not true.