Your H is in no position to argue. He cheated and he has to repair that damage.

He should not have been doing #11 in the first place.

He can claim they are safe all he wants. YOUR COMFORT should be MORE IMPORTANT than the need to socialize with women in private.

If he can't avoid private meetings with women then he has no business being married because he has his priorities misconfigured.

Growing up means prioritizing marriage before friends. Period.