Is it permissible to spy on a cheating husband with the intention of reforming him, knowing that he suffers from psychological problems, practices masturbation, refuses confrontation, and leaves the house? And is it possible to reclaim him from his addiction to haram after he has become immersed in it, especially since he requests anal intercourse, which the wife refuses?

We advise the questioner to be patient, seek Allah's help, and frequently supplicate for her husband. She should offer him sincere advice, remind him of Allah and His punishment, and clarify the حرمة (prohibition) and danger of sins, especially since for a married man, indecency is even more heinous in ugliness and punishment. It is not permissible to spy on him, nor to enable him to commit anal intercourse. To reform the husband, one can benefit from consultations related to this aspect.