How to react to his birthday?

So me and my guy are on a break more like I’m just giving him space. He spending time with his kids and I’ve been working. So his birthday is coming And I wanna know how should I react to it should I send a HBD text short texted. Should I do the four happy birthday should I go on social media. I’m trying to show him I’m not too clingy but I miss him.
How to react to his birthday?
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