ANSWER:
By being there for that person. Tell him or her that you are there when he or she is ready to talk without judgement. Or give him or her some space so he or she can face what's going on.
Getting a girlfriend can help you, but time will be the best.
start thinking of her as a friend and not as a ex girlfriend. treat her as if she is your friend and try to get comfortable around her as a friend.
You should tell her about it, as a best friend she should accept your interests in him. In return she may help you win him over.
you forget she is your best friend and hate them both
if he/she is really your best friend you should be able to say as nice as you can to get over herself and youll help him/her through whatevers happened but they have to c-oporate without them being offended.
get a new friend
A best friend forever is a person who is a close and trusted friend to someone over an extended period of time.
ask your best friend if he likes him and if she doesnt than wait for him to get over it and he'll realize he likes you
Comfort Her
If you hover over the best friend on your friends tree you will see a star button which says Un-Best Friend.
if he was your ex you should be over him. If your not over him you should tell your friend or try to get him back.
just tell him and get over it you should feel happy for her she is your best friend