Justin Bieber has hit the brakes on his relationship with Sofia Richie just a few months after the two were first spotted together.

Justin Bieber, Sophie Richie Split

Bieber and Richie’s short-lived romance was apparently not too serious to begin with, but now it’s officially over, according to reports.

“They were never officially together, but more casual hanging out and having fun,” a sourced told E! News. “It was super-hot and heavy, and because Justin doesn’t want a relationship right now, he wanted to cool things down.” The source clarified, “It wasn’t an intentional cool-off, just sort of happened on its own.”

A photo posted by Sofia Richie (@sofiarichie) on

Last month, Bieber and Richie were seen packing on the PDA in Mexico while celebrating her 18th birthday. The daughter of Lionel Richie explained that the trip was about her exercising her newfound “freedom” as an adult to Billboard magazine. She added of Bieber, “We have a special relationship. Justin is very easy to talk to, and that’s hard to find with people in Los Angeles.”

Apparently, while Richie acknowledged that the two weren’t officially a couple, that didn’t stop her from hoping that the day would one day come.

“They have not discussed titles yet with each other, just taking it slow,” an insider told E! last month. “Sofia would like to be exclusive and hopes it will lead into that shortly. She has always had something for Justin.”