Dramatic switch between over complimenting to none?

My boyfriend usually compliments me every once in a while.. which is fine with me bc we’ve been dating for a while but something strange has happened. So for about 1 week he was complimenting me like several times a day everyday. Then the next week (present) it shut off like a switch, I’ve complimented him because I like doing that and sometimes it prompts him to say something.. but nothing. What could cause this dramatic behavior?
Dramatic switch between over complimenting to none?
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