@boredgurl04,
Well, your friends were wrong. Your friends I assume are also 12 or 13 year olds?
You were very silly for making a big deal of "promise me you'll tell me this", as if it were some earth shaking information you required.
At your age, there is a big temptation, especially among girls, to make everything a big drama.
Better would have been to keep it loose, as in "Hi, wanna go to Burger King with me?" or something like that. Then the 2 of you can talk face to face.