If she/he doesn't listen to you, get your other friends to either talk to her/him about it, or hang about with them instead of your best friend until she/he gets the message.
If she/he doesn't listen to you, get your other friends to either talk to her/him about it, or hang about with them instead of your best friend until she/he gets the message.
Stand Up to Your Best Friend
Come Out to Your Best Friend Before Your Parents
Show Your Love to Your Boyfriend
Stand Up to Your Enemies at School