Such a long answer. A first step is to understand better the nature of your personal jealousy. Look at to what degree your feelings are based on experience, and how much your jealous feelings relate to mistrust.
Good communication is basic to a good relationship.
Learning to tell others how you feel, good or bad, but in non-judgmental ways, is vital. Building good listening skills is the other side of the coin for good communication. It is important to listen to and hear what others say. Asking for clarification when you are not clear about another's position is a good thing to do. If the feelings of jealousy go beyond issues of good communication and trust, you might want to enlist the help of a counselor to sort out the issues.