Why has the frequency of his text changed?

His replying has been really bad the last few weeks. He won’t reply to my text until around 5pm and then take a hour in between to reply to each text. He never use to be like this but now it’s changed. He does text me everyday and we call here and there but it seems like his feeling have changed. (he does work night shifts)

Why has the frequency of his text changed?
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