1. hallucinations or mental problems: if this man has mental health problems, such as schizophrenia, depression or other psychological problems, he may see or feel things that don't exist. In this case, he is advised to seek professional medical help for diagnosis and treatment.
2. Infidelity or deception: If this man really sees the shadow of another woman outside, it may be because he is unfaithful to others. In this case, it is suggested that both husband and wife treat each other honestly and communicate to solve this problem. If necessary, consider seeking marriage counseling or professional help.
3. Misunderstanding or misjudgment: Sometimes people may misunderstand or misjudge what they see. If what this man sees is only his misunderstanding or misjudgment, I suggest him to think more and confirm more to avoid unnecessary misunderstandings and contradictions.
No matter what the situation is, it is suggested that both husband and wife be honest with each other, communicate deeply and find the best way to solve the problem. If necessary, you can consider seeking professional help, such as psychological counseling or marriage counseling.