Is this a sign of insecurity or was he only joking?

I was telling him my phone number and he says “Is this a fake number, should I call you to make sure this is real?” I immediately said no it’s not fake and he responds saying he’s only joking.

I’m not buying it because from my thought since we’ve been briefly socializing that remark seems as if he believes there is disinterest and I would give him a fake number.

Thoughts?
Is this a sign of insecurity or was he only joking?
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