Guys, Need help I am confused.. Please help?

I have this guy in office.. I don't know how to react to wht he says.. He just asked me today do I have any religion issue in my family. When I said no.. Then he was like we can get married. I really can't understand is he joking or serious.. He always flirts, pretend he is jealous?
Guys, Need help I am confused.. Please help?
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