He sat across from her trying to imagine it was the first time. It wasn't. Had it been a hundred? It quite possibly could have been. Two hundred? Probably not. His mind wandered until he caught himself and again tried to imagine it was the first time.
Here's the thing. She doesn't have anything to prove, but she is going to anyway. That's just her character. She knows she doesn't have to, but she still will just to show you that she can. Doubt her more and she'll prove she can again. We all already know this and you will too.
This is important to remember. Love isn't like pie. You don't need to divide it among all your friends and loved ones. No matter how much love you give, you can always give more. It doesn't run out, so don't try to hold back giving it as if it may one day run out. Give it freely and as much as you want.