You dont.
Be honest with both, but remember to be a friend before worrying about entering a relationship. Friendship can be forever
talk to him/her about it privately and see if he or she likes you back but be careful if it dosent work out you dont want your friendship to be destroyed
It depends what way you mean. If you mean like as in fancy then theres nothing wrong with that. If you mean like as in friendship like then obviously otherwise they aren't your best friend.
become his friend. not flirty, friendly.
ill ask him out
your friends boyfriend will breakup with your friend, and your friend will get mad at you.
You are 13. Chances are, this probably won't work out. You will meet plenty of other guys in your life. Friendship is forever, so i would try to ignore the "chemistry".
deny and ignore
you punch them in the mouth
Well if you do not fancy them but they fancy you, you should say "I want to be your friend but I am not ready to go out with someone at the moment". and if you do fancy them, try and get to know them, then see what happens!!:D
snog his face off
Develop a friendship and go from there.