Return of the forsaken Heiress: Regret of her Ex-husband
For a man whom she has spent 7 years with, married for 3, infertility was enough for him to cast her aside, replacing her with his mistress whom was already pregnant.
But maybe getting cast aside was a blessing in disguise, Elisa returns home to regain her rightful place as the heiress of the Gilbert's house, and what follows after is the continuous regret of her Ex-husband.
After all, the saying goes this way: You don't know the value of what you have until you lose it.