My brother's friend likes me?

hes my brothers friend i dont know whether he likes me or not but i think he might. a few days ago my mom was late picking us up from school and since he was coming home with us and his house was nearby my mom told us to wait there and him and my brother went on the trampoline then he came back out front and asked me if i wanted to go on the trampoline with them but i couldnt cuz i had a sprained ankle and he seemed disappointed. then at my brothers baseball game yesterday he said hi to me as he passed by. then later he walked by again with his friend (not my brother) and gave me a high five then as he was wallking away i heard him say "yes!" like he was surprised i did. does he like me or not and if he does what should i do cuz i kinda like him too.