This guy I really like slapped my bum, advice please:)?

RoseChickadee
Hii, I am 18 years old and so is the guy I really like. Basically, I crushed on this guy for like a year at college. He left college and we didn't see each other for like 7 months. I now see him out up town practically every Saturday night. He had a girlfriend and told me he likes me and slapped my bum with force. Anyway, he turned single and followed me around the night club and stopped on a step. He then started seeing someone and he randomly hugged me. When he was seeing someone, I kissed one of his friends on a night out, not a close friend but one of his mates. He walked past us pulling evils. I then started ignoring him and showing him no attention. He walked past and gripped me down there. Next time I saw him, he acted like I didn't exist. However, I saw him up town again and he was giving me the eye on dance floor and smiling. I was seeing someone though. Next night out he slapped my bum quite hard and made a shocked face and smiled. I touched his arm and smiled. Anyway later on in the night, I went to speak to him, he said a few words and kept staring at me. He was acting all shy. But he's a really confident guy. Why does this guy have the confidence to slap my bum but can't speak to me that much. Advice please? In college, he tried to ask me out and said he liked me to his friend. I've had boyfriends. I don't really know what to do. I like the guy very much even when I have a boyfriend and I feel as though I am being unfaithful to him by flirting with this guy up town but I can't help it. I really like my boyfriend of a month. But I am literally obsessed with my crush. I don't wanna break up with my boyfriend for things to go no where when I do like him. I don't flirt with other guys just my crush. What should I do?:( What should I say to my crush? I really want to be with him :( what's going through his head?
This guy I really like slapped my bum, advice please:)?
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