Should my step-daughters be told that their step-father has a child pornography addiction?

My husband's ex-wife married a man who was charged with seven felony counts of pandering involving a minor. He, by his own admission, is addicted to child pornography. My step-daughters are now all teenagers. They do not know. My husband's ex-wife has kept this information from my step-daughters. The step-father has had issues regarding his pornography addiction recently. The ex-wife minimizes it by saying that he has "repented." It is a constant strain on my husband, knowing that his girls are living with a man who is addicted to child pornography. My own therapist believes the girls should be told. The ex-wife says her therapist says the opposite.