How can I ask him?

I have a guy friend who was kind of flirty with some other girls but not on the level he is with me. he’s friendly. I know I’m different because he always used to like scaring me just to see my reaction and would call my name by doing it. Every time I would walk near him he would just say my name for no reason lol and I would say his name back. Once early in senior year I asked him to sit next to me because I forgot my laptop and he did it. it was dark and he was really close and he kept whispering to me how he felt uncomfortable ( he doesn’t like to be touched ) and I wasn’t even touching him. He touched me all the time lol while teasing me soo? When I straightened my hair , he noticed and commented. We all went to cook out and a random guy said hi to me and my guy friend asked me if I was good afterwards. Once he was like “isn’t that right “ and said my name and I said I didn’t say that and he said he would never put me in an embarrassing situation. Then another time he moved seats in class and sat in front of me and he called my little sister his little sister. Does he like me? I don’t want to start liking him if it sounds like he dosent. I hope he’s not just flirty. How would I go about asking him?
How can I ask him?
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