Most Helpful Guy
First off, you're not to blame. You did nothing wrong. At the same time, your boyfriend isn't wrong either. You are both so young. Both of you are going to change over the next few years, and as painful as it is, you're better off parting for a while.
Most Helpful Girl
Nearly everyone thinks they'll never love anyone like their first love and they'll be together forever, you don't have a unique experience, you have an extremely common one. What you shouldn't do is force the relationship or beg for it, and understand that it's not the be-all-or-end-all and there are way worse experiences than losing a first love, so try to put that in perspective and allow yourself a lot of room to grow.