From the first four chapters in the preview, I feel like it's very similar to Girl on a Train. Woman is obsessed with her old husband and his new woman, calls the new woman, has become a mess since the divorce in which the husband got all the old stuff and now she's a broke shell of her former self, drinks, and couldn't get pregnant. I would be interested to read the rest of this to see if it plays out differently. Had a good beginning as well.