As of January 2016, Billy Miller is dating actress Kelly Monaco. The couple met while working together on the television program "General Hospital," where they have a romantic on-screen relationship as well.
Miller and Monaco have been dating since at least July 2015, when they were spotted near Malibu, California. In pictures captured by the paparazzi, the couple is seen having intimate moments while swimming in the ocean.
Prior to Miller's relationship with Monaco, fans speculated that Miller was dating Sam Morgan, another "General Hospital" actress. These rumors started after the two had been seen together publicly a number of times in early 2015, but no romantic relationship actually existed.