Polls: Guy's Behavior

So I’m 20 and I’ve been working at a resort for over a year now. I have a supervisor A and recently her brother S (18) just started in the office recently he’s totally my type low key feel set up. Our coworkers are constantly telling me he’s looking at me and our eyes meet all the time but I’m shy af so I look away as fast as he does. We talk here and there usually fist bump all the time but today he held his hand out (I was very confused) then I went for a handshake and he hand my hand for a second while he said good night. Other than his sister he doesn’t talk to girls in the office so I assumed he was just shy but now I feel 15 with mixed signals. Staring contest, sharing snacks, and brief hand holding what should I do with that?

I am looking at my profile picture on another site. My hair is wavy / curly so it looks wild loose. And thinking looks good for friends, they know me.

But I look like I rolled out of bed to strangers & couldn't be bothered about my looks though.

This guy has never had an affair in 18 years and is best friends with his wife. He doesn't even admire other women around his wife. So why would he suddenly want to sleep with one particular person? he's admitted he's missed her, he acts almost possesive around the other girl if she talks to anyone else, but on the other hand he picks on this chick all the time and refuses to talk to her about anything having to do with his personal life. He tries REALLY hard to play it cool. So, why start things with this chick at all?

I have already heard what girls have to say on this matter now I want to hear what the guys have to say, so please feel free to express your views, I'm not the judgey type at all.

ok let's begin..

So a male friend at work constantly teases or picks on a female friend I work with. Whenever he sees her, he riles her up because she's kind of fiery and he seems to love getting her worked up. Whenever I or another co worker are around, he'll pull us in to join in, " see what she did now?" Kind of thing. I'll be talking to her and he has to join in, to what seems like get her attention on him. If another person is talking to her, and it's around him, he also starts in on her. I've caught him watching her and then other times it seems like he completely snubs her. He picks on us all, teases us when we screw up at work, makes fun when we talk, but no where close to as much as her. It's almost like he lights up when he sees her. I have seen him defend her though but I guess he tries to watch out for all the girls at the office.