[She knows it's natural. She knows, and that's why it's so damn frustrating, because there's nothing to blame and there shouldn't even be anything to be mad about. It's not even that she...]

I'm not doubting that.

[She didn't know about "best", but she knew... She knew he loved her the way she was. That's why this felt so petty and small of her to even think in the first place, and yet...]

... But he'll still know. Even if he'd still choose me like I am... Once he's seen me that way he'll know how it could have been.

[If things were different. If he had just fallen in love with someone else.]