Friendship need trust.We protect and helping each other.Don't be a 'Two-faced bitch' Be there for your best friend,Do not let your best friend face all those problems alone.Help them. If you can't, support them.Your best friend need your supports.Don't hook up with your best friend's ex.It might broke your best friend's heart.Don't lie to your best friend just tell the truth.Don't be so secretive.Most importantly, Do appreciate your best friend before its too late. Cheers