She's really trying to get over him for good.

Selena Gomez has cut Justin Bieber out of her life and changed her phone number, Us Weekly reports. "She told everyone not to give it to him," a source dished to the mag.

What caused her to finally cut the cord? Their Instagram fight this past August. The "Come & Get It" songstress lashed out when JB defended new girlfriend Sofia Richie against Internet trolls, and shortly thereafter the singer canceled her Revival tour to focus on her mental health. She claimed she was suffering from anxiety brought on by her lupus, but we all know she just spun out about losing The Biebs to another lady!

"Selena lost it. She can be fragile emotionally and Justin is a major factor," the source added.

Changing your number only works if you don't call the person you're avoiding in a moment of weakness!