You go up to her and kiss her and say hey babe go out with me
Get rid of so-called "best friend". If you're girlfriend is true to you, she will stay with you.
nekt time you see her ask her out
ask anyone if they do and then you could ask the person whos girlfriend you like what they would do if they knew
Just laugh about it, and ask if she will prefer your best friend to you. She might be saying the truth but not to move along with your best friend.
You should share your concern with your girlfriend and ask her directly that what she wants from your relationship. Also ask your best friend to help clear the matter. If he is also interested in your girlfriend then maybe its better to dump both of them. Since a true friend/girlfriend will never do so to you.
Ask your friend's girlfriend why she thinks the way she does and try to resolve the problem/connection between you two.
ask them to be your girlfriend. or if your a coward get her drunk take advantage and then use the tension the next morning as a fat penguin.
you tell him and ask if your really best friends, because best friends should never ignore you
You're screwed. Make a plan for your friend and his girlfriend to breakup. When theyr done. Wait a while and ask her out
Then the real question is why isn't your best friend your girlfriend........?
The duration of My Best Friend's Girlfriend is 1.92 hours.
Ask them to be your boyfriend/girlfriend (i dunno which gender you are so...)