Ok, so, this guys and I are unofficially dating. He flirts with me, tells me he wants to marry me, put his arm around me etc. Even though we don't go the same school, he goes and asks another girl to prom? He also teases me about liking certain guy friend of mine (though he know I like HIM), and he jokingly mentions how this or that girl, he would like to marry if they were older. What is going on? I feel like he just can't make up his mind. Me, or flirting around with everyone.
Honestly it sound like he's using you, and because you don't go to the same school he can go around flirting with anyone he wants and you won't find out. Get rid of him and move on, he's not worth it. If he's not willing to spend time on you, don't waste yours on him.