It Ends with Us by Colleen Hoover 

In this “brave and heartbreaking novel that digs its claws into you and doesn’t let go, long after you’ve finished it” (Anna Todd, New York Times bestselling author) from the #1 New York Times bestselling author of All Your Perfects, a workaholic with a too-good-to-be-true romance can’t stop thinking about her first love.

Lily hasn’t always had it easy, but that’s never stopped her from working hard for the life she wants. She’s come a long way from the small town where she grew up—she graduated from college, moved to Boston, and started her own business. And when she feels a spark with a gorgeous neurosurgeon named Ryle Kincaid, everything in Lily’s life seems too good to be true.