Billie who is a so- called psychologist acts like aan irresponsible mother and a delusional psycho sex maniac with all of her fantasies and what ifs . Of course as a mom you would not denies the feelings and thoughts of being wanted and having a great sex with your partner. But instead of talking this out to Cooper, or seeing another psychologist or even psychiatrist, she chose her own way of cheating with Brad behind her husband's back , keeping Brad in that kind of push pull cycle where she can manipulate everyone around her to get her damn sexual pleasures and physical needs met without considering others emotions and feelings including the kids. Such a borderline personality type kind of woman.
Maybe before becoming a wife or psychologist herself, perhaps she should sort her shit out first before passing it on to her kids or others.
This makes me feel gross of how this character was brainlessly created.