Boy advice! please help?

(Im gonna try 2 make this short) I started talking to this kid on christmas day. We got to no each other. And I fell for him. Bad. At first he said he "kinda liked me" well then a while after that he was telling my best friend I was good for him and I make him happy. We get into a lot of arguments cause ill admit it, I get jealous. We aren't dating. But during the superbowl, lol, he asked if I was tlking to other guys I said no, r u? He said no I wouldn't do tht 2 u. So I umed I kinda had "dibs" on him. Lol. But now, we barely talk he is really short with me, I still really like him and want things to get better. Any advice?