HELP PLEASE!!!.........?

I really like this guy and i know that he really likes me. We flirt all the time and people in our classes joke with us about it. We sit near eachother in class and talk all the time and when we text, it's usually until one of us goes to sleep. There have been two occasions when we hung out outside of school and the first time was with other people, but we kinda went off and hung out by ourselves and then rejoined the group. We just click and flirt so much, it's great. The only thing is, i can't get him off my mind!! I've been thinking about him allll day! What should i do?