Most Helpful Girl
You made a mistake: you asked him to go with you as a friend.
If you are flirting with him and you like him, you shouldn't be slapping him with the friend sticker. He will likely read that as: oh, she wasn't flirting, she was being friendly.. she probably doesn't like me and is doing this to reaffirm that we're friends.
You need to make sure it's known that you do like him, unless you don't plan on taking things any further.