Emotions like jealousy, envy, anger, etc, can be weakened, and even purged. Emotions are feelings attached to ideas. The feelings are patterns of tension and relaxation in your body. If you learn to relax, deeply, in those areas where you feel the jealousy, the emotion will dissipate.
First, identify where in your body you feel this emotion. While feeling the emotion, turn your attention inward, to the inside of your body and ask yourself where the sensation is centered. Forget for now about the mental part of the emotion. Concentrate on the physical sensation.
Second, relax that area of your body. You can do this with yoga, breathing exercises, strenuous activity like jogging, a sauna, anything that you know helps you relax. While relaxing imagine white light flowing into that area of your body. This mental image speaks directly to your unconscious mind, telling it to relax that area of your body.
This takes practice. Every time you feel jealousy, relax and focus on the area of your body where you feel the sensation. Using breathing exercises to relax is convenient. You can’t always take a sauna at the drop of a hat. After a while the sensation of jealousy will weaken and the ideas associated with them will seem less important, and even silly.