And who would you EXPECT him to blame?

You are the closest person to him.
If he blames YOU then he is not at fault,
he does not have to look within.
You can not control any of this.
Only YOU can control YOU.

TG has given you good advice but let me add that
when you make the changes you make them for YOU.
Not as a strategy to win him back.
As J3B would say their are no TRICKS here.

Me-70, D37,S36