Lies My Girlfriend Told Me — Julie Anne Peters

When Alix's charismatic girlfriend, Swanee, dies from sudden cardiac arrest, Alix is overcome with despair. As she searches Swanee's room for mementos of their relationship, she finds Swanee's cell phone, pinging with dozens of texts sent from a mysterious contact, L.T. The most recent text reads: "Please tell me what I did. Please, Swan. Te amo. I love you."

Shocked and betrayed, Alix learns that Swanee has been leading a double life--secretly dating a girl named Liana the entire time she's been with Alix. Alix texts Liana from Swanee's phone, pretending to be Swanee in order to gather information before finally meeting face-to-face to break the news.

Brought together by Swanee's lies, Alix and Liana become closer than they'd thought possible. But Alix is still hiding the truth from Liana. Alix knows what it feels like to be lied to--but will coming clean to Liana mean losing her, too?