My boyfriend always ask me if I want to marry him in a conversation?

Its like if we're having fun together suddenly he will pop the question "Do you want to marry me?" and I will answer it, "Yes". It always goes and goes but he didn't ask it in a serious matter. I don't know if its for fun or something. I met him like over a year ago already. I'm not in a rush as well as not that desperate in getting into serious commitment but I'm a little confused since he always act like this for over 2 months now.

My boyfriend always ask me if I want to marry him in a conversation?
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