Who knows?!

Who knows their s/o has an engagement ring for them but just doesn't know when they'll pop the question? 
Lmao, I'm just wondering since my BF has a ring for me (He made me go back to where he was since I was shopping in a different store, made me try a ring on and ask if I liked it; to me I don't care as long as he picks it out from his heart ^^, then made me look away as he purchased it) 😂
He likes to tease me and say "you won't know when I'll ask you! That's one surprise secret I'm keeping to myself!" (He's usually not good at surprising me).