Exile is defined as the forced removal of one from his or her native country. This removal can be either forced (by a commanding group or individual) or self-imposed (one exiles himself or herself).
In regards to exile in Gustave Flaubert's "A Simple Heart," Félicité (the protagonist) exiles herself from her home (a farm) because of a broken heart. Her love, Théodore, marries another woman. Her heart broken, Félicité moves to Pont-l'Évêque. Here, she is hired by Madame Aubain as a house servant.
Needing a new start, Félicité's self-exile allows her to find a new life which proves to be poignant in the end. Although never truly loved, Félicité finds love (in her own rights) in the image of a parrot. Although the love she extends is never returned, Félicité dies knowing what love really is. She never would have found this without leaving for Pont-l'Évèque.