what should I do if my x boy friend is going out with my friend and shes my best friend.
that's like a girl policy to not date your best friend's ex. I would stop talking to both of them. If she acks why you arent talking to her tell her how wrong that is. Make he choose between a best friend and some boy, if she doesn't choose you, you're better off without her
You should get over it, if she likes your ex, then you can't stop her. As long as you don't still have feelings for him then it should be fine.
She's not your best friend if she is dating your ex. As simple as that.
get a new best friend. and dont talk to your ex.