Terrible situation, There is really no way to say whether he will or won't get better or even if it's a mental illness or he's just a horrible or spoiled person. So many questions that might never get and answer to. Somethings are never explainable.
I think your friend would benefit from seeing a Therapist to help process all the feelings in a healthy way as to allow her to go about her life even though her son has hurt her in many ways.
At this point your friend "owes" him nothing.
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Helping others gets me out of my own head ~
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