Is it a sign of cheating if your husband who never cared much for his appearance suddenly out of the blue starts grooming a lot?

He's dressing a whole lot better, taking care of his facial hair, hair etc. very frequently when he didn't used to at all before. Also, he's been posting a lot of quotes about how he should enjoy life, be around positive people, and how he used to be stressed before and now he wants to be chill.

Is it a sign of cheating if your husband who never cared much for his appearance suddenly out of the blue starts grooming a lot?
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