Why would my husband sometimes joke about me cheating?

Anonymous
It’s really not often or have an sort of pattern but sometimes when we are being affectionate he will crack a joke like “you got another guy on speed dial or somethin?” And then I joke back and stroke his ego like “nah babe your dicks to good for me to look somewhere else” not exact words but stuff like that lol
it’s dumb but it occurred to me that it’s an odd thing to joke about. It’s such a fast interaction.
I am deeply afraid of being cheated on but never instigate these types of jokes.
why would a man make these sorts of jokes? He doesn’t seem insecure, quite the opposite in fact.
Why would my husband sometimes joke about me cheating?
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