Should I wish my ex a happy birthday?

We dated a month and we broke up because he needed to focus on his work and studies ! :/ but on and off he would drop me Random text or reply to my instagram stories... but I replied to his yesterday to a text he sent and he didn’t reply the whole day today but he keeps coming online, tomorrow it’s his birthday and if he didn’t reply to my texts should I over right my text and wish him or just ignore? Or is it weird to call him tomorrow evening and wish him?
Should I wish my ex a happy birthday?
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