Hey, I didn't have a lot of time to post before, I was having a rough day... buuttt.... I will try to help now that i have a free min.
I am getting better a lot better... I have been wanting to feel less jealous for a loonngggg time. In my mind it's like i could see all the terrible things my boyfriend (of over 3 years) would /could do. And it would hurt me to think those things... What I did was:
-Have More Trust : If he says "I love you, I wouldn't risk screwing us up etc etc", I have begun to trust that as truth (afterall, it's the truth when I say it). Then, whenever something would happen where i would get that sneaking suspicion, I would remind myself of all those things.... it helps.
- Bach flower remedies: Flower essences (simillar to homeopathics, but not exactly). There are many for different personality traits... "Holly" is one for envy, jealousy and suspicion. "Aspen" Is for fear... etc... you can tailor them to which ever you need. They helped a loottt.
- Reason with myself: If I am faced with a scenario in which I know deep down the only reason I feel a certain way is jealousy... I make myself realize that, and basically bombard myself with logic.
Anyways, those things are helping me a lot... and I remind myself of my self-worth, and my boyfriends love and care for me...

All together= feeling a ton better.
Good Luck!