only if she likes you back if not then no.
Because he probably likes you. :-)
You should talk about it with your best friend. You both should be able to date whoever you want!
Neither of you should get to date him.
Your best friend should not determine who you date, but she might have some insight that you are not wanting to see about him. You should definitely find out why she does not like him and then make a decision about dating him.
Comfort your friend, then ask if its OK to date him and if she says yes do it.
No.
The best person to date is your best friend.
You should ask your friend first on how she feels if you date him before asking the guy.
Date the guy your best friend likes.
No I wouldn't recommend it because all he would do is just get in between you and your friend. Staying single will do the trick for anything :)
Did you ever mention to your friend that you like this guy? Just try to be friends with him and tell him flirty jokes. In My "Opinion" I feel you should respect their relationship. It's going to be hard to watch your best friend date the guy you like but, if you want your best friend then you will just let this guy go and move on.
I think that you should make sure that you and him are still friends, and so when you do date then you can date him.