Halfway to Heaven — Juliet Gray

A man can only love once and Marnie still possessed Adam's heart. But Marnie did not need him as did Tamsin, who had fallen in love so impulsively. Adam committed himself to Tamsin, believing that his own happiness was at an end with Marnie's going away - and then she came back with a claim on him that he could not ignore. Tamsin was forced to stand aside. Loving him, she had no future with him after all and she would never be nearer than halfway to heaven...