Do you still remember receiving a ring from your boyfriend? That is a promise ring. I still remember mine; an adjustable heart shape ring which I received from my first love when I was 17 years old. A promise ring is a declaration of our love and commitment to each other. The ring promises that our love will stay pure. Promise rings are normally the step before the engagement of a couple. We were still too young to get engaged or married but we want a symbol of our love and commitment towards each other and a promise ring is the best symbol of our love. Go read more about the promise ring etiquette.
By the way, I think I lost my promise ring. :(