A week long stand
You live with someone for seven days, steal their identity, and walk out like you're the main character of a movie and they're just the sidekick
I lived with my friend for a week, stole their identity, and walked out like I was the hero of a movie.
He stayed with me for seven days, took my identity, and left me like I was the extra in a movie.
She was with me for a week, took my identity, and left me like I was the background of a poster.