Most guys would rather not have to face the possibility of rejection if they don't have to. My friends tend to stare a lot and get nervous when the one they like talks to them. If they sound like they are more caring than before they might have deeper feelings for you.
I know this from experience, so please do not make a big deal of it publicly, it is really awkward for the guy for a long time. My experience with that was not only a huge let down but my friends got on me about for a few months.
Guys don't like rejection. Probably the majority of guys wouldn't put themselves up for rejection unless they knew there was a good chance of it not happening. How does this happen? He finds out that there's interest coming from you.