She may be a love addict instead of a sex addict, but there is something definitely peculiar going on here.
Usually a woman who is just a WAS would not argue to stay in the marriage; it's usually quite the opposite, they can't wait to get out (at least at first). Her behavior seems more that of an addict - she wants to have her addiction (drugs, alcohol, sex, or "love" addiction) but doesn't really want the rest of her life to change.