possible engagement

Help! My boyfriend of two years isn't the best to keep a secret. I have a feeling he wants to propose. I'm not 100% sure, but I honestly believe he wants to, soon. With him asking questions about rings, and mutual friends giving me a hint to. I don't think I am ready yet.. and I don't want to ask him about it if he isn't even thinking about it. I just don't want to get the point of him on one knee and me have to say no infront of a lot of people. please help!!!!