If a man or a woman is consistently flirting with the opposite sex is that the sign of a bad marriage?

If a man or woman flirt consistently with the same person is that the sign of a bad marriage (eg something isn’t quite right and they are seeking attention outside) or are some people just naturally inclined to do this even if it doesn’t bode well with their husband or wife?

If a man or a woman is consistently flirting with the opposite sex is that the sign of a bad marriage?
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