What's wrong?

I want to be her, I want to be the girl laughing on the tree trunk. But I'm not.
[...]
'I look around at these sunflowers.' [...] 'And the photos. All my things here. And I can see that it happened. But it looks like a wonderful romance between two people I don't know.'
[...]
'If I could just remember one thing. If there was one memory, one thread...'
[...]
'You said you needed a memory.' [...] 'Now you have one.'
[...] 'it's the thinnest thread in the world.'
[...] 'Don't let it snap.'

[tratto da: Remember me?, by Sophie Kinsella]