My friends with benefits (guy ) I think forgot my birthday , he remembered before we even did this benefit thing but now he dosen't say it anymore?

I'm just curious on this since back when we used to be together , he remembered , even after we broke up but this time since were fwbs he dosent say it or acknowledge it, why?
My friends with benefits (guy ) I think forgot my birthday , he remembered before we even did this benefit thing but now he dosen't say it anymore?
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