Neighbors? Friends? Classmates?

Thats nothing near the definition of your relationship. It was more like sealed fates, two faces of a coin, sticking together like an object and it’s shadow. As when you guys were both toddlers in kindergarten, you two got a play with the roles as Romeo and Juliet. After the play, she promised that she’ll marry you as when you both get older. Now that we’re at college, but she still seems never take her promise back.