@Fireman7606,
Sounds like he is teasing you. Honestly, he doesn't sound like a very nice person. He's trying to mess with you. Maybe it's part of being a teenager, maybe he's just like that.
I'd suggest backing far away from him, not just because of his age but his age is a piece of it.
Stop the texting asap. He is underage and you could get in trouble for some of what has happened - not because of your actions but because he is trying to lure you into texting / saying something inappropriate.
Seriously - if this was any gender combination I'd be raising the red flag about what this young person is doing.
Back way way way away. Be polite when you see him - definitely no alone time - avoid the drive through when he's around - no more texting.