Why won’t he respond?

So me and my ex stopped texting and I’m not completely over him and on his birthday I texted him I know we don’t talk anymore but im still gonna say happy birthday sooo happy birthday and he replied with thanks and I asked him are you completely over me and he replied with are you? And I said no and he saw it and didn’t say anything and I said hbu and that was 2 days ago and he hasn’t looked at my last text message but he’s been active so all I wanna know is why and what’s probably going through his head?
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And what should I do?
Why won’t he respond?
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