If a boy has a girl as best friend,then what happens if he love her? will they make good pair?

Yes, I definitely think having a strong friendship first really helps establish a closer bond ..When chemistry and love are there too, friendship only helps it develop more :)

well i believe a relationship does best when they know each other very well. i mean if you guys had differences then you wouldn't be best friends with her, right?

I think that the strongest relationships come from good friendships. "Friends first, lovers later"

best friends AND lovers?...what a wonderful situation!

Well, there is the saying: Marry your best friend.