Promise ring dilemma

Evelina • Nothing is impossible, even the word itself says "i'mpossible'. ✌️👸
Hello to you all gorgeous ladies! I'm kinda new here but I need an advise.. So I've seen a lot of posts for the "promise rings" my bf mentioned a few times already that he wants to buy me a ring but I'm pretty sure he means engagement ring. However, I'm not yet ready to commit to an engagement 1) we're still a "new" couple 2) we'll be separated for about a year because I have to finish my studies. I want to get you opinion about if I should bring up the "promise ring" subject or should I wait to see if he buys a ring? 
P.S. Sorry for the long post! 🙈