Welcome to our forum.
I think jealousy and insecurity sometimes grow out of feeling like you have some kind of need that isn't being met. You have to get to the bottom of that, and communication is usually essential. Not just how much you communicate, but how well you communicate. We can all do better, it's a lifelong learning process.
I also recommend the link drtalon mentioned. Hope some of this helps.
Love means never having to say, "Put down that meat cleaver!"