IB, your son is going through his own stages of grief. He will pass through this anger part.
My son went through it, too. I was steadfast in my actions and my boundaries. I also let him know it was ok to feel as he did. I never, ever said a word about his father. I was there for him as much as I could be, often quietly and in the background. I let him know that there was nothing he could do that would ever make me stop loving him.
I also knew that some of this was due to his hormones. Boys go through it differently than girls. It took some time, but, eventually the anger stopped.
One day he came to me and said, thank you, mom. I said for what. He said, for letting me get this out of my system, for understanding that I was hurt and lost and for always being there for me.
IB, your son knows way more than you think. And I promise you he does not blame you for his father leaving.
Trust in how you raised him. I promise you it will get better.
