Who is Winifred 'Win' Tuttle Cobleigh from Almost Paradise and what is their importance?

Winifred 'Win' Tuttle Cobleigh is the red-headed heiress, who falls for James Cobleigh shortly before WWII. After he goes off to war, he cheats on her with a Frenchwoman, and he goes on to have countless affair. Eventually, Win and James separate, but they never divorce. After sixteen years of separation, the couple gets back together.