Boyfriend always jokingly/pretends to propose to me, WHY?

Anonymous
My boyfriend and I have been together for almost 2 years, but known each other for 3 years. Lately he is starting to talk a lot about the future especially pretending and jokingly proposing to me. When I say yes. He just says great or when I ask him why (that question) he says "just checking". I really don't understand his actions, really...
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+1 y
not just that, but his face is serious when he asks..
Boyfriend always jokingly/pretends to propose to me, WHY?
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