How to deal with jealousy

Photo by Claudio Schwarz on Unsplash

A punch in the pit of his stomach at the sight of his partner when he talks to someone else animatedly. The unpleasant feeling arises when the mother praises the brother and pays more attention to him. These are feelings that everyone has experienced at least once in their lives.

How do these emotions spring up? Is there anything you can do about it?