Boyfriend has yet to tell parents

My boyfriend and I have been in a relationship for almost 3 months. My dad has known about the relationship from pretty much day 1. My boyfriend has yet to tell his parents officially. His parents are pretty judgemental, but i’ve gotten along with them great. To them, we’re still friends. i’ve even gone to church with him and his parents and i do everything i can do to make it more comfortable to tell them. He tells them there’s “potential” for a relationship and he leaves for the military next year. he was originally supposed to leave in january and promised me they would know then but he has yet to tell them. our relationship is perfect in all other aspects yet he knows this really bothers me. what should i do?!

edit:

i don’t wanna hear that we’re not serious or any of that, i’m asking what should i say/do to make it easier.