My person “jokingly” said he wishes he was having sex with others?

My ex & I are working on dating again. I asked him if he was having sex with anyone else and he responded “I wish”. When he later asked me the same a month later if I’m intimate with anyone else I said the same “I wish”(I actually have no desire to be with more than one person sexually) (stds) he was very hurt by response though as was I. But why does he think he can say things to me but gets upset if I say the same exact thing? He always says it’s just a joke which most times isn’t funny. I feel like he’s gaslighting me & is is never authentic.

My person “jokingly” said he wishes he was having sex with others?
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