According to Life & Style, Selena's mother and step-dad had an intervention to tell Sel it was them or the Biebs after he randomly showed up to her birthday party in July.
Afraid the two celebs might rekindle things, her parents apparently gave her an ultimatum.
"They told her this was the last straw," a friend reportedly told the mag.
"They told her Justin was a really bad person. They said she has to rid him from her life, otherwise they can't be a part of her life - her new baby sister included."
Selena was reportedly devastated by the whole thing but obviously decided to side with her family.
Aww, we kind of feel bad for her but really, he's not a good look right now Sel.
Do you blame Selena's family for trying to stop her from dating Justin? Do you think they really gave her an ultimatum?
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Gallery | The Selena and Bieber Romance