Here are some tips:

Accept your feelings. The first step to overcoming jealousy is to accept your feelings and understand that they are normal. Feel free to talk to your partner about how you feel and ask for their support.

Understand your emotions. Try to figure out what causes your jealousy. It could be fear of loss, distrust, or other issues that may have roots in past relationships. By understanding your feelings, you can better understand what steps you need to take to overcome jealousy.

Examine your past relationships. One way to deal with past relationship jealousy is to examine your past relationships. Understand what went wrong and what lessons can be learned from these experiences. Seek advice from a professional psychologist if necessary.

Work on improving your self-esteem. If low self-esteem is the cause of your jealousy, try working on improving it. Find hobbies you enjoy, play sports, socialize with friends and family. Working on self-esteem will help you feel more confident in yourself and more confident in your relationships.

Seek professional help. If you can't deal with jealousy from a past relationship on your own, seek professional help. A psychologist can help you sort through your feelings, find ways to overcome jealousy, and build healthier relationships in the future.