The moment those words come out of the doctor’s mouth, Finley’s entire life has changed forever. The life she dreamed of with Brody is obliterated, destroyed. 
She can’t utter those once magical words, “I love us”, even though she still desperately feels them. It’s that love that forces her to leave. 
The worst thing is, Brody can’t know why. If he discovers what Finley has hidden, 
he’ll follow her across the ocean. He’ll show up in London and destroy his own future in the process.
So Finley must break him, break their precious “us”. She must keep her secret so Brody can have a chance at his own happily ever after.
Because second chances are made for good guy’s like Brody. And that’s exactly what she’s giving him.