GUYS, help me out, pleaaaase.?

Sounds like you are in high school, and at that age guys are well....idiots. Chances are he is afraid of approaching you so he is making him self known by being loud in hopes that you'll notice him. He feels that being sweet to you in front of his friends will knock his image so he wants to maintain his sense of manliness by dissing you in front of his friends. Confront him about it one day, If you see him in the hall pull him aside and ask him whats going on. You may be surprised at the response.