Cadet, should I completely ignore him then? But also be positive and happy? We have the grad party this weekend. He is a snarling, hissing cat around me. Quietly steaming. It's awful.
I think this is a good place to start. Get on living your life in a positive and happy manner. Stop engaging him and only respond when absolutely necessary.
You want him to pursue you in a respectful manner. Other than that you have no time for him and are busy with your life.
