Why would he try make me jealous?

So this guy I’ve been getting to know purposely tried to make me jealous. He sent me a snap really late in the evening & I kinda asked him where he had been and he said he’d been out on a date. I made a joke off it and tried to brush it off & then he said ‘do you wish I had been out with you?’ I replied saying he already knew the answer to that. And he said ‘I know but it’s always nice to hear.’

Why was he purposely trying to make me jealous?
Why would he try make me jealous?
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