Jealousy, like physical pain is not always a bad thing. It lets us know when something is wrong. It tellls us when something needs attention, either within ourselves or with our relationship.
I suggest you may want to introspect what needs you have that are not being met. And if your husband were meet those needs, what that that would look like. Communicate that to him.
Relationships can be solid, but they aren't rocks. They are living organisms that need care and maintenance. Some are like cactuses which need very little and bloom with every little rain. Others take more.
Me: 48 - Married, straight, male
Shiela: My wife.
Suzanne: My FWB
Adam: Shiela's LDR