Is this considered a fraud marriage?

I know a couple who is married and have a son. The man who is an green card resident not a US citizen brought them from Peru and left them 2days after their arrival and the women has a boyfriend now. The man has been living with another woman way before his family got here. Is this consider a fraud marriage??? Isn’t people supposed to live for an amount of years after entering US so this marriage won’t be consider as afraid???? Also should I call immigration to tell them about this situation so they can investigate???? Help is really appreciated

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