Jealousy is nothing more than fear of abandonment. If you are feeling an uncomfortable or disruptive amount of jealousy, then it's a sign that there is something wrong with the relationship. You abandoned yourself because of your jealousy.
This quote has helped me a lot of over the past few months. It's hard for me sometimes to let go of something that other people do and it makes me so angry, but then I remember this quote: " Take a deep breath. It's just a bad day, not a bad life.