"Demi is completely done and doesn't want to see him again at this point. She can't believe she fell into his trap and is really upset over it."
Since their split, the 'Anyone' singer has been leaning on her family and friends.
The source added to E! News: "She's been spending a lot of time with her family and friends to help heal from this and they are all keeping her occupied and rallying around her."
Meanwhile, Max recently hinted his romance with Demi is over for good, as he posted a cryptic message on social media about coming to the end of a "chapter".
He wrote: "One chapter finally closed this am. And now I turn the page. Focused on wellness, love, God, my family, friends and my art. Good vibes only :) x (sic)"
But in a now-deleted Instagram Story, Max claimed their relationship hadn't "officially ended", as he said they hadn't been able to talk about things.
He said: "Up to this moment we haven't spoken over the phone ... we haven't even officially ended anything to each other. Literally. I'm here in real time with y'all."
"I love Demetria and just want her to be healthy and safe ... If you're reading this ... I love you always ... unconditionally ... no matter what. (sic)"