Hi there, I'm no expert but I've found often jealous really comes from personal insecurity about something, or as a reaction to something someone else is doing that doesn't feel right. It can also, for me, have something to do with things I feel like I'm not good at and fear especially in relationships that someone ELSE will have that quality and my partner might leave me/not appreciate me as much because of that.

also maybe some examples of what makes you jealous would help here =)

I'm sorry - jealousy is so hard to deal with and wish you didn't have to go through it