Whatever he does or doesn't do he regrets and wishes he had done the converse.
Husbands are worried about their wives; wives about their husbands; parents about their children; children about their parents.

Farmers are worried over their crops; speculators over their gamblings; investors over their investments.

Teachers are worried over their pupils, and pupils over their lessons, their grades, and their promotions.

Statesmen (!) are worried over their constituents, and the latter are generally worried by their representatives.

People who have schemes to further--legitimate or otherwise--are worried when they are retarded, and competitors are worried if they are not.