You drifted apart so much because it kicked off at 14/15 and got serious. No kid knows what they want from life at 14, not enough to commit to one person. It's a sad read thou man.
I did the same with my first gal. We got together at 15 or so, shit got too serious then you loose your mates after not speaking with them because your too involved with this girl. I broke up with her at 19. I probably could have spent my life with her but doubtful it would have been happy. What I wanted from life changed through age and experiences.
I always wonder with your first 'love' what would happen if you got back together 5 or so years later when your much more stable, sure in what you both want.
I've not much to put in here to be honest, Jenny and I bought a house in February and moved in 4 months ago after renovating and it's going good . Christimas is gonna be a shit as Jenny's really family orientated so she'll want to spend a lot of time with hers which is no problem but it'll be hard to find time together to enjoy it. Cross that bridge when it comes thou I guess..