They might have gotten a divorce, but that didn't mean she didn't love him. Even with the camera she took all those pictures with, she still loved him dearly. Even if he loved someone else, even if they looked perfect together, even if she knew she was only hurting herself, she'd never stop loving him. Why else would she still hit Gilbert with her frying pan?
A/N: I was more thinking of Switzerland when referring to another love, but it works with anyone other than Gilbert(Prussia). That would be because he's being hit by Hungary to keep him away from Austria. No tormenting Roderich for you Gilbert!