My boyfriend used to call his ex girlfriend mommy, I am wrong for been mad at him?

My boyfriend had a 2 year relationship with this strange girl who had mommy kink. And I just came to know that my current boyfriend who I am dating for past 8 months used to call his ex mommy for almost 2 years. And when I asked him he simply said that he's not into any kink it's just his ex who had it.

Do you guys think it is possible that even after living with girl who liked been called mommy for 2 years he doesn't have any desire for that now? Am I overthinking or is my boyfriend trying to hide his kinks? Rest everything is pretty much normal between us.
My boyfriend used to call his ex girlfriend mommy, I am wrong for been mad at him?
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