Friend with benefits didn’t wish me happy birthday even though he knew and messaged me about something unrelated?

I’ve been sleeping with someone, we talk regularly but mostly about work, we get on but don’t have much in common or any real chemistry. On my birthday he viewed my posts and messaged me late that night about something unrelated, but didn’t wish me a happy birthday and we haven’t spoken since. Am I being dramatic to be annoyed that I’m always there for him but he didn’t take 2 minutes to say a simple happy birthday? It would have been nice to know that he at least cares to send his well wishes. Should I say something or just forget about it?
Friend with benefits didn’t wish me happy birthday even though he knew and messaged me about something unrelated?
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