How do guys act when they like a girl?

Well theres this guy who sits next to me in switch class. Hes not like shy but he hasnt had a girlfriend yet and I guess he’s not a flirt either. I think he’s cute even though most people dont? well anywaysss.. he talks to me sometimes and we mostly play this litto game when we get a paper out of our notebook we threw thoses things at the end to eachother and it makes me happy because even if he doesnt do alotta stuff atleast its something you know?! ahaha. welll this one girl ask him do you like jesse? and he was like who _ (my name)?! and she was like uh no? I said jesse. and I asked her and she said that she asked him jesse VERY clearly. hes not like scene-ish but he has his bangs down his face and he listens to screamo. and well I like screamo but it isnt what I always listen to. I just dont know what to do. I dont know the signs he could do? maybe he will tell his friends? (I dont really talk to anyone of them and they would probably tell him that im asking about him unno? )or GAH I don’t know!!! help me please? should I give up or what? ://

(guys would be bettter in this question to answer) thanksss.