Most Helpful Guy
I agree with you entirely about HER
understand why HE thinks the way he does
you GAVE UP any "rights" to know anything about personal relationships outside of work, e. g. them dating or not WHEN you broke up
To ask for this privilege (at work or not) DOES smack of using your authority to force an action from underlings, some even seeing this as a veiled threat to their jobs. You can't DO that and if really put to the test in front of YOUR superiors, could be harmful to your job... so cease this. Turn a gblind eye to whatever they are doing.
You have bigger fish to fry and a shopping list that obviously finds him lacking, so DO your shopping looking ahead, for looking backwards will trip you up.