A Catholic friend of mine is currently going through a divorce and has moved out of the house he formerly shared with his wife. He is currently living with a female friend of his and her family. Neither of them see a problem with what they’re doing since they aren’t living alone and since they aren’t sharing a room. They also both say that it’s a completely platonic relationship, therefore there’s no problem with the amount of time they’re spending together.
So here’s my question. I see this all as a hugely problematic situation, if for no other reason then that it causes scandal. How can I make a clear argument that this is a problem? What can I use to back up my claim?