Girls or guys can have people from opposite sex as their best friends. But in your case since it is causing problems, so you would have to talk it out with her. If you think that this thing can cause problems in future then you would have to rethink your decision of staying together very seriously. Otherwise, if you think you have a strong relationship and you trust her, then such things should mean nothing to you.
tell her how you feel and she will try to sort it out I'm sure. You can't ask her to ditch him coz she might end up ditching you instead coz she might think you r being 2 over protective- just tell her your uncomfortablebottom line think about if hes worth jeopardizing your relationship
If you feel that way, hang out with her friend. Try and get to know him. You may like him as a friend. Evaluate him meaning watch him and do more listening than talking because he'll probably give himself away. I know how you feel but after I experienced this, I said I was going to hang out with my girlfriend's friend and we ended up friends and I talk to my gurl and she said shed loved me and wasn't looking for a replacement. In a way, it's good that a woman sees jealousy in a man because it shows that you actually care for her and they like that. But good luck with this.
Do remember she is with you and not him - don't forget that. Trust her. Hope everything works out ok. X
Dude get the hell out! Run fast let her have her "best friend". Don't trust girls! They are all crazy and will cheat on you.
I think you sould find yourself a girl best friend then your girlfriend will get jealous and the afterwards your two can discuss how you feel with each other
So she has a guy for a best friend!! You can't help who you click with! Just trust her, if you have reasons not to trust her with this guy then ok but if your just being jealous cause hes a guy well oh well don't be so sexist! Hang out with find out what hs like you eventually know your doing the right thing just by excepting it!! GOOD LUCK
Go get a best girl friend and see how see feels