Do I tell him happy birthday?

I just started hooking up with this guy... just a booty call, I mean I like him but we're both super busy and not looking for anything serious. His birthday is in a couple weeks and he only told me the date once.. do I text him happy birthday when it comes up or will he think I'm a pyscho? Lol dumb question but I'm just curious a man's perspective

Do I tell him happy birthday?
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