Our expert says:
Sounds like this could be an example of what we call pathological jealousy, which can be helped through counselling, but this is difficult to achieve as the individual often doesn't see themselves as having any problem at all. It's good news that he has accepted this fact and that he is seeing someone for therapy --- we can't predict how fully he may be able to learn to control this jealousy, but the fact that he agreed to therapy is a promising sign.
Maybe ask if it would be acceptable for you to join one or two sessions with his therapist, so you can better understand how you can help
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