Here are some tips on how to not be jealous:
1. Realize that others are human too and their successes are not your failures. In the same way that you get jealous of others, others get jealous of you .
2. Consider why you're in a relationship. It's important not to view your partner as a possession, but as an autonomous individual whose happiness you care about .
3. Get to the bottom of your jealousy and create a healthier relationship dynamic .
4. Try these strategies to distract yourself from jealous thoughts before they become overwhelming:
 - Write down what you feel.
 - Take a walk.
 - Give yourself space by leaving the situation.
 - Take 10 minutes to do something calming .
I hope this helps!