Bert has always loved Mary, he'll always wait for her to come back, when she leaves to help another family. He wants so much to tell her how he feels- but she's too perfect to love him. After being politely rejected - he moves on with his life, although he still remains best friends with Mary. After realising she had made a mistake and loved him back - she had to try win him over again. Although, what she hadn't realised, is that he'd never stopped.