Hi Kathy,
I’m facing similar concerns and just wanted to let you know you’re not alone. You seem to have quite a bit of awareness of what’s going on internally for you; I think that’s crucial in moving past jealousy. For myself, I’ve found that jealousy is fundamentally a pointer about my own deeply rooted, negative judgments of myself. As previous posters have said, self-love is certainly not easy, but a great, and I think lasting, tool for healing judgments about self, and moving on to feel more secure.
Sending you lots of peace and loving-kindness; it may take time but you can do it! =)