The thing with the 3 girls, that happened to me, and I didn't know what to say, and my friend looked at me, and with a very serious face he told them I was gay. Problem solved. (kinda)
Oh, don't be shy, he sounds like a fairly outgoing person, just smile, wave, and... Are you ready... Well I'm Gonna Do This To You For Emphasis Jk. So, smile, wave, and get to know his friends, and remember, the key to the gate keeping closed a man's heart is food
If he is staring at you, and he continues while your looking at him he is either thinking or lost in your eyes, look back, and if eventually he looks away fast he likes you. That's how I lead girls on... Er, the ones I like. Not just anyone