"Selena's family will never forget how appallingly Justin treated her," a source told RadarOnline.com.
"It breaks Selena's heart that her mom still can't forgive Justin and accept him in her life, even though she's begged her mom to give him a chance."
The former Disney darling is trusting therapy after doing a stint in rehab and couples counseling with Bieber, 23, according to insiders.
"The plan is for her mom and Justin to work through their issues with a therapist," dished the informant.
"Selena will be there for some sessions, but not others."
The songbird — who recently revealed she had a kidney transplant — hopes a group session will smooth out the tensions between her mom and 23-year-old Justin, sources said.
"Selena's mom is giving her space, but at some point, they're going to have to talk this out," the insider said.
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