Why would a guy joke about marriage multiple times?

I met this man once one live night, we live in different states. We have been talking through FB everyday for 2 months. He's joked a few times about getting married in Las Vegas. He's 10rd older. I joke back and say okay, we have fun banter. I get that it's a joke, he keeps saying it, why?
Why would a guy joke about marriage multiple times?
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