What does it mean when he jokes about marriage?

Anonymous
I've only been with my boyfriend for about a month, and he doesn't even like to use the term "boyfriend" or "girlfriend" although he does say we're exclusive, committed to each other, etc. Lately he's been making a lot of jokes about marriage, which confuses me. Obviously he's not really thinking about it, so why does he joke about it? Do you think he does it to make fun of me, because I was the one who wanted to be "official"? I don't mind the jokes, they're kind of cute (He'll just say something like, "When we get married.etc." but with a joking smile). What's he doing?
What does it mean when he jokes about marriage?
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