I have a crush on this guy and he first acted interested but suddenly he's ignoring me

So, I have a crush on this guy. Last week, he sent me a friend request on FB and liked my プロフィール picture... and あなた probably can imagine how happy I was. On Thursday, he randomly messaged me and gave me a follow on instagram (I REALLY didn't expect that) and asked me if I'm going to a club on Friday night, and I 発言しました that unfortunately I'm busy but I'm going on Saturday. So this was last night, obviously. He also asked me if I wanted to have a drink または two with him, and of course, I 発言しました yes. I was soooo excited I couldn't sleep and couldn't concentrate all day. So, last night, I went to the club, he was there with some of his friends, I was there with some of mine. He didn't even bother coming up to me, he didn't even LOOK at me. He only looked at my legs (???), but I can't say if it was in a good way または not haha. My フレンズ and I later had a bite to eat and of course HE was sitting at one of the tables with some of his フレンズ and they kind of looked like we were following them または something haha, idk. His フレンズ were watching us but he didn't even look at us/me. Also, one of his フレンズ kept greeting me/waving at me every time I walked past him (but only when HE wasn't around) and 発言しました "See あなた 次 time!" as they left. I haven't heard of him yet and I don't think I will. I don't get it?? Do あなた think I should message him and ask him if we can have a drink 次 time we see each other? I'm so scared that he won't reply.... this is so weird....what do あなた think about this?

One of my best フレンズ kind of likes him too and she messaged him but he sort of turned her down. Twice, actually. And then he asked ME if I wanted to have a drink with him.

My friend was there too but I don't think he didn't come over to me because of her. And I don't think he's shy...