Why do i still think about him?

I’m 16 and from New Zealand, and when I was 10, me, my mom and step dad went to Jamaica for a vacation. I remember meeting this 19yr old guy who worked there, and we became friends instantly, I’m still thinking about him today and I remember he’s name. Every time I hear the song he sang me ‘Mario-I Don't Wanna Know’... (I think) I cry. He just thought of me as one of the kids at the resort probably but I remember everything about him, what he looked like, and he knew I really liked him because I cried when I said goodbye. Why do I still think about him? He wasn’t Jamaican, he was brown though, the same colour as someone from Samoa, but I know he wasn’t from there. He’s name was Kerry. I realllllllyyyyyyyy miss him and every time I find a film I get it developed in case it has the picture of us cause I remember some being taken of us. I remember him saying to me in private "come back when your older" and I just stood there and I gave him the biggest hug... it’s been like 6yrs... I’ve had heaps of relationships since, and I truly remember him. What’s wrong with me? It’s not that I can’t get a guy. I can. I have one. What’s wrong with me!!!! I want to see him again, but how? I don’t even know where he lives, what country he’s in now, where he is from, how he’s name is spelt, from. Has he forgotten me? His probably met thousand of other girls. But I’ve met thousands of guys... and his all I think about. Every time I see a brown guy or kiss someone. What’s wrong!!!! I miss him...