Selena Gomez has been casually dating, and the mystery behind “that guy” has been revealed.

Last month, Selena was doing a makeup tutorial with her Rare Beauty line.

In the background her Nana can be heard asking, “So, how did you end it with that guy?”

Obviously, the singer was completely stunned and at a loss for words until she blurted out, “I’ll tell you in a second.”

Following this video, Selena was spotted on a yacht enjoying the Amalfi Coast with friends and one guy in particular.

His name is Andrea Iervolino and it just so happens that HE’S “THAT GUY!”

Our sources tell us the two have been dating on and off for years.

Our source says, “They have been dating all in secret for a long time. They are currently broken up.”

Apparently, the relationship is “a hook up, break up, hook up, break up” kind of relationship.