How can i stop obsessing over this guy?

so on Friday, i went to youth group with my bff who i havent seen in 2 years. i was hanging out with her, her bf, and her ex bf. We were playing this game (we meaning the whole youth group),where the majority of the youth had orange ribbons on their arms, and we had to run (and try not to get tagged by) the people with blue ribbons, and we had some popsicle sticks, and if one of our team mates got tagged, we'd have to give up a popsicle stick, if we ran out, we lost and we had to get to certain places around town before we ran out of popsicle sticks. Anyways, my friends ex was really nice, and he talked to me the most, my feet started hurting, and he kept asking if i was ok. my team came to one of the spots, he asked me to hold his hat while he wetted his hair down, then he asked if i could hold his hat for the rest of the time, i said sure, he said ur awesome. and he was walking really close to me, and ive been thinking about him since. i even had a dream about him. i know its stupid, but how can i stop obsessing over him? and do u think he likes me or was he just being friendly?