Why did he do this...easy 10 points?

Guys are wierd!! I think that maybe he likes you, and wanted to sorta make a point about you getting off work at 1. I think the high five was a random thing that he though would be cool at the time (I bet he's thinking "Why did I do that?!" now). It didnt quite work out for him!! The random thumbs up? I dunno, thats probably just a guy thing, or soemthing he thinks is cool. But basically I think he likes you, but you make him nervous so thats why he is acting kinda wierd. Just be really friendly etc towards him and hopefully he'll stop being so wierd. Hope I helped!! :D