What does 2 Samuel 20:3 mean?

When David got back to his palace in Jerusalem, he took the ten women who had been left to take care of the house and put them in a guarded house. He provided for them, but he didn’t sleep with them. They lived like widows until they died. 2 Samuel 20:3 - Modern Text Bible

(David separates the concubines who had been with Absalom, caring for them but not restoring their previous status, reflecting the complicated aftermath of Absalom’s rebellion.)