Search Results: signs a guy likes you laugh

So, the guy in Question is called Nico. He is an instructor at the gym I go to and is a year older than me (21). We had a nice conversation few days ago. I was just about to ask for a pen, to sign ny sister up for one of the HIT courses. The conversation went as follows:

I: Could I have a pen please.
He searches for a pen before realizing he was leaning on one and handing it to me.
N (Nico): Didn't you sign up for the courses already?
I (super enthusiastically): Yeah, sure. I'm just signing up my sister.
N (unimpressed): Oh, great.
I: How about a bit more enthusiasm?
N: But that means two of you.
I: Come on, it's not that bad she doesn't complain as much as me. (I always talk back to him and such.)
N: But that's why I like you.
I (confused): Because I complain?
N: No, because you counter my jokes.

The conversation went on for like ten minutes. before I had to leave and we were laughing a lot. So his face turned red and I made fun of it by saying..

I: You're face is as red as your shirt. (The uniform of the gym has red shirts.)
N: Oh yeah. You're making that up now.
I: Sure. Bye.
N: Your face is as white as your shirt.
I (sarcastically): What a nasty comment.
N (laughs): Alright, have a nice weekend.

So he's like really cute but sadly not my type. He's super muscly and actually one of the 'cool' guys, however he turns kind of awkward when talking to me. We talk a lot actually. After all he also talks to me when he is exercising himself.

Anybody have a clue on him?