The Opportunist (Love Me With Lies #1) by Tarryn Fisher
Olivia Kaspen has just discovered that her ex-boyfriend, Caleb Drake, has lost his memory. With an already lousy reputation for taking advantage of situations, Olivia must decide how far she is willing to go to get Caleb back. Wrestling to keep her true identity and their sordid past under wraps, Olivia’s greatest obstacle is Caleb’s wicked, new girlfriend; Leah Smith. It is a race to the finish as these two vipers engage in a vicious tug of war to possess a man who no longer remembers them. But, soon enough Olivia must face the consequences of her lies, and in the process discover that sometimes love falls short of redemption.