i am a divorcee with a preteen kid. Just last year, i separated from my husband. I am independent working woman and able to raise my child. The problem is that he is blaming me for the separation. I cannot bear this behaviour from him as he is my life.
If possible, take him for a counselling. It can be a professional or a family senior. He might open up more freely to a third person and you can prevent him from hurting his future with such thoughts
Spend some quality time with your preteen. he will cherish those moments. Indulge in some some games and other interesting activities so that he gets to know your better. you can share your side of story with him.