Hormones can do both damage and good to a teenager. If it wasn't for them, I wouldn't have boyfriends cuz I personally think it's a waste of time. I know you're probably laughing at this. Even I find it pretty funny to hear that come out of my own mouth but I'm just stating what's on my mind.
First you start off as friends. Then after a while, you like each other and you wanna be more than that. After you guys start dating, there really isn't anything left to do. It's either you get married or you guys break up. Have you ever thought of it from that perspective?
So don't ever be in a relationship with someone if you don't have the slightest intention of marrying him/her. Don't wanna get married nor break up with that person? Get your priorities straight or just be friends forever.
Cheers.