My ex wished me happy birthday... on the wrong day. How do you deal with persistent ex?

My ex texts me out the blue saying he hoped I am having a good birthday today. My birthday is in two days. Is it because he misses me? Does he regret cheating? Why communicate with me at all, when we have not seen each other in almost a year? I do not want him back. Should I just ignore or respond "Thank you, please leave me alone or go crawl back into whatever dark hole you climbed out of?"
My ex wished me happy birthday... on the wrong day. How do you deal with persistent ex?
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