Therese never fought for francie, she outright told Anthony that he could keep her since he was the one that wanted a child. Don’t go thinking that she put up a brave fight for her because she didn’t. The divorce was uncontested with her moving out of Anthony’s life and into an apartment with her boyfriend.
to add to my previous comment, in the book fleur was far prettier than in the movie. The producers couldn’t find a radiant beauty as described in the book i guess.
Liz wasn’t totally innocent here. She did lead Paul on, led him to believe she was coming back, when she knew she wasn’t.