This could be a sign of self-esteem issues (or other stuff; I'm not qualified enough to speculate) that will or already does diminish their quality of life and happiness.

And if they "get over" the wealth difference, your brain will find something else. Take it from someone who spent more than two thirds of his life "getting over things" inatead of addressing the root causes. But then again, you're not me or anyone else, you're you. Everyone has their own path, but I shared mine in case it helps you find/improve your own going forward.