who is your best friend?

This is just one simple question with one demanding answer for you and your friends around you!

1 what are the one thing you want in a friend?
2 what don't you want in friend?
3 how would you tell a real friend from other friends?
4 what would you do if your best friend went out with the person you liked?
5 what would you do if your best friend was being bullied?