If a man's wife is messaging single guys (more than one) on websites a lot - is this emotional cheating?

I know that if I was married and my husband was messaging women on websites all the time for years, I would be livid about it and feel like I am not fulfilling something in him that he's getting instead from all these other single women. Emotionally Cheating is what I call it.
If a man's wife is messaging single guys (more than one) on websites a lot - is this emotional cheating?
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