Cherishing the Captain by Elise Marion

Captain Gideon Whitlock never thought to see the woman he spent one unforgettable night with again. His years at war have changed him into a different man—one he feels certain she could never bring herself to love.
Sylvia Whitlock has moved on from being abandoned the man she eloped with following a reckless night of passion. Telling herself she doesn’t want or need him, she dedicates her life to healing the wounded, traumatized soldiers of the Crimean War as a nurse.
When Gideon’s suddenly appears at the home for soldiers where Sylvia has taken a new position, they will both be forced to face their past. They must also consider what their future will be, and whether the pain of their separation will prove enough to keep them apart for good.