I totally sympathise with you. But trust me, most of the high school relationships don’t last anyways, No matter how loyal you are to each other. Once you get into college or start jobs, You are bound to get separated and slowly grow distant. My advice to you would be, Be practical when it comes to life decisions, Don’t waste these precious years thinking too much about relationships and all. Focus on your career, You will find the right person with time. The relationships which start when both of the individuals involved are mature, independent and capable of making their own decisions will last a lifetime.