is seeing how Agnetha changed from happy and married to sad and unmarried during ABBA's ten years of success.
You see how happy she looks here? She's genuinely happy - you can see it in the eyes. When she smiles, it's an actual smile.
And here, she's smiling alright, but her eyes are sad. You can see how sad she is and it makes me so sad. Poor Agnetha. :(