The email from your husband does not strike me remotely as bad.
He admits guilt. Do you know how many of us have stood by and watched the people we married destroy everything rather than admit guilt? That's huge!
He acknowledges he has a part in all of this. That's huge too!
I agree with the above advice regarding that email. Those first two paragraphs were originally worded more for you than for him. Sadly, you're the adult for now. So, you have to consider everything for him.
