Together Forever (2011)

Original title: Juntos para siempre

Screenwriter Javier Gross denies his past by making up fictional stories. Lucia, his wife, tired of his fiction, starts an affair. But not even the confession of infidelity touches Gross, who is caught up in the story of a script that is writing, whose idea is so powerful that dominates it completely. Lucia, after seeing that Gross is unshakable, decides to leave. But Gross wastes no time: the same day replaces Lucía by Laura. From day one, Gross confuses the names of women. Thus Laura is transformed into a second copy of the true love of Gross.