Whats going on with my best friend????!!!??

me and him have been best friends ever since he moved to my town which was about 3 years ago. we have been inseperable from the first time we spoke! iv never wanted a greater friendship! every time wer at eachothers houses, we play silly or flirty games (but just as friends!) but lately, he hasnt been afraid to get reeaallyy close to me. like yesterday, we were on a blanket in my yard watching a meteor shower and all of a sudden, he started rubbing my arm in a slow way. it sorta tickled, and i started to laugh and thought it as nothing. but later, he started rubbing his feet against mine, he laid his hand on my hip and twirled my hair. i was really wondering what was up. wer both 13 and we'v never had experience with dating or things like that. later, we were getting ready to ride my bike back to his house when he suddenly started acting funny again, grabbed my arms, pretended to wrestle, and put my back against the garage wall. then right there, he kissed me! i was so shaken i gagged!