BF HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ok well i`m 15 and i`ve been dating my bf for a yr. We`ve known each other for 5 yrs. We`re VERY close cuz he is my BEST friend. We`re in love (tho ppl may think we`re too young) he`s been through a lot with me and has ALWAYS been there 4 me. Now what do i do if he gives me a promise ring? i know i`m young but i dunno sometimes i think he may b the one. Trust me, i`m a very sensible realistic person and i know how to seperate love from infatuation, so what do i do if the subject (or the ring) pops up??????? PLZ HELP!!!!!!!!!!!thanks!