@ali54,
Most of the cases problems with self esteem come from the family. If they couldn't show their love for you, or they were really harsh with you, made you feel not good enough, never was satisfied with you, or may be even you witnessed the behaviour of jelousy from your parents. I am not saying this to send some idea to become angry with your family. The other thing I could think of to make you feel so jelaous is if you don't feel secure in this relationship, may be not appreciated enough, don't feel your partner pays much attention to you. Jelousy is a relly painful feeling for both (the jealous person and the partner), puts you in a bad position in the relationship, but it is not thing that you can't overcome. Just take the time to really get to know yourself better (think why you feel you don't have to trust your partner, try to assume that you are wrong and see if you calm down or you continue thinking, your partner is doing something wrong), really think of different cases when your partner may be didn't gave you a reason to be jelaous, think of things your partner has done for you to show her/his love! Another book I love is for better comunication - Clean Slate Method By T.W. Jackson