Why didn’t he wish me a happy birthday?

I’ve been chatting to this guy for over 3 months now and we met once due lockdown conditions. To keep things alive during lockdown we’ve been video calling and sometimes things get naughty. After our last call the other day, I decided to tell him my birthday was going to be in 4 days to what he replied “Ohhh how excitiiiiing, sending you lots of love wish I was there to hug you” then I said “wish you could be there well save the date” and he replied “I SHALL XXXX” but then on the actual day I posted a couple stories on ig he saw them all and sent nothing. What the hell? I thought this was ver strange!
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I mean I know our last call lasted almost 5h and it got sexually intense towards the end and I understand if he needs some distance and time to process but I mean seriously after everything he didn’t have the decency to text me on my birthday?
Why didn’t he wish me a happy birthday?
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