yea im dead sure that this guy you're talking about does like some girl on the camp..
guys mostly try and act as the cool dude and show off when they are eager to impress some girl..
so keep your eyes open..
if you also want to know who she is,then,
notice him as in stuff like does he give special importance to some specific girl,makes an effort to talk to her,looks at her when she is not looking..!!
well not only him..even his friends..guys usually have their good buddies in on the secret if they're into some girl and want to win over her.so maybe you can start noticing his friends too whether they tease him over someone,look at some girl etcectra etcectra..!!
hope i helped!!