Is the questioner sinful for tampering with the belongings of the young man living with her in the same house? Is she accountable before God if she remains silent about the presence of pornographic films with him? Did she err by informing her husband? What is the ruling on this young man living in her house?

You are not permitted to be alone with the non-mahram young man, nor to spy on him. Rather, you must advise him and cover his faults as long as he is apologetic and not openly defiant. Seek Allah's forgiveness and repent to Him, apologize to the young man, advise him to fear Allah, and appease your husband, clarifying that freedom does not justify what is forbidden. The young man's stay is permissible as long as there is no seclusion or harm.