Hearts Out of Time — Judith Ansell

Sister Emma Treloar had once been very much in love with Dr. Patrick Cavangh, and they had planned to marry. Then disaster struck, and Emma believed she had the best of reasons to free Patrick, but she had to tell lies to do it, hurting them both.
Now Patrick was back. And he was to work with Emma in the new community practice. But how could she tell him the truth at last when this remote man seemed to have no vestige of feeling left for her?