SOLVED. I can’t remember the author or title! [s]

[MELONIE STELLY]

Hi I am trying to remember the name of a Chick lit novel about a woman obsessed with her fiancé’s ex. I think the fiancé’s name may have been Donald but I’m not sure. I just remember the ex comes to town and the heroine begins to stalk the woman, who of course is beautiful but manipulative. Thanks for any assistance.

[Mai]

Her by Laura Zigman?
Elise meets Donald on a flight to Washington, D.C., where he teaches and she edits self-help books. He is dreamy: 6’6” with unflinching green eyes and a proclivity for speaking frankly. Incredibly, they fall in love, get engaged, and start discussing wedding invitations.
And then Elise meets her—Adrienne—Donald’s stunning, leggy ex-fiancée. Adrienne is newly single and planning a move to D.C. Cleavage-baring, half-French, and with a degree from Yale, she seduces men with one flick of her hair. Worst of all, she and Donald have remained “good friends” since they broke up. Convinced that Adrienne is out to win Donald back, Elise begins stalking both of them obsessively . . . and starts adding up clues to what looks like a brazen affair.

Found searching "chick lit" "obsessed" "her fiance's ex".

[MELONIE STELLY]

Yes!!! That’s it. Thank you so much, Mai! It was driving me crazy!

[Lobstergirl, au gratin]

Melonie, please put genre and plot details into your header (title), per the Group Rules. The rules are at the top of the "Group Home" page (click to the right, above).

[MELONIE STELLY]

Will do