The Rosie Effect the Sequel to The Rosie Project is Affectively Substandard

Graeme Simsion's award winning novel THE ROSIE PROJECT of a oddly affecting intellectual, Don, and his quest for a suitable mate was a winning wealth of warmth & wit.  Having found love with the formidable Rosie, a beautiful, intelligent, independent free spirit, Don & Rosie get married, move to  NYC and are expecting their 1st child.  The curious & endearing characteristics that makes Don so likable still prove amazing & admirable (to most) and incredibly irritating & dysfunctional to those who fail to grasp the spectrum of Don's immense capabilities & capacities for compassion.  Rosie who fell in love with Don for all his strengths & oddities is now finding these traits do no suit her in a mate & co-parent. The overall tone of THE ROSIE EFFECT is grating.  Why would Rosie chose to terminate their marriage prior to BUD's birth (body under development?)  Why have Rosie's affections wandered?  Are we to conjecture her feelings may lie with Gene, the womanizing machine.  He has left his wife, moved from New Zealand & ingratiated himself into Rosie/Don's lives and apartment?  Still, there are new individuals who had to the quixotic cocktail of increasing friendships adding a delightful stir to the mix.  Unfortunately, there are also lascivious men and mendacious women; Lydia a cruel psychologist & a misanthropic lesbian researcher with a chip on her shoulder. The novel does speak to impact of what we say to one another.  The spreadsheet here proves the downers more potent than the warmth found in THE ROSIE PROJECT which I enjoyed.  Overall, THE ROSIE EFFECT is disappointing and disheartening.