Should I reply to my ex immediately or wait at least 3 hours?

my ex dumped me , since 1 month ,, after that he immediately jumped into a new relationship then he regreted his decision after 2 weeks and have been liking my posts but never talked to me ,, today is my birthday he sent me greeting should i relay or not ps i love him but i afraid he gonna play with my heart
Should I reply to my ex immediately or wait at least 3 hours?
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