The klone and I by Danielle Steel
Roger has left Stephanie with 2 kids and he's suing her in the divorce. She took care of everything for him.
She started taking better care of herself after he left with his girlfriend. She had to pay alimony and custody out of her trust fund.
She meets Peter in Pairs and as he has to work he has created a clone of himself: Paul Clone.
He was just too perfect and she stayed in touch with him. Paul Clone is only the same as Peter in looks only.
So funny when she tries to find the perfect mate.