Which one (Shawn Mendes X reader)

The singer, Shawn Mendes, finds himself falling for two persons at the same time. He is in a relationship with a beautiful young woman that is an actress. Their relationship is not public but he thinks he is the one even though they're very different. But when he bumps into beautiful photographer at a cafe and spills his orange juice on her does his mind change?

Who will be the one?