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In a situation like this, if they aren't married, then they are roommates and this would be considered a violation of your divorce decree.
With that said, your recourse is to file a motion for contempt of court for his violation of the divorce decree and have the judge modify the custody arrangements so as to take this violation into consideration.
But it would be questionable as to whether you could unilaterally withhold his overnight visitation rights due to this because it would then put you in breach of the visitation order..
So when you are asking the judge to modify his order, it is best to come to court with "clean hands" and show that you are the innocent wronged party.