Relationships don't mean anything until you graduate highschool. While you're in school, it's all hormones. The point of a relationship is to find the person you'd possibly be spending a large (see: rest) of your life with. Noone really has the ability to seriously look for that kind of relationship at that age. If they did get into a relationship with their highschool sweet heart, they either got lucky (if their still together), or they made the relationship serious after school.