Oh you know some men do this, they say the children will understand when they are older, sending a sinister undertone that sounds like a threat to say they will know what you a really like and why I had to leave you.
Bollocks, that is just those men trying to justify their actions to anyone who will listen
What the children will understand is that their mother stepped up while their father stepped back. The father will then give the mother no credit for that and go even further to say that she turned the children against him.
Some men go through life playing the victim.
Having said that the patterns of your marriage can't be wiped out in a few months, just as they didn't develop over a few months. Accepting these setbacks, accepting that it really is him, not you will take time but ultimately will help you to continue to move forward.
You have had a sudden and traumatic experience being left by him, and yet, you have taken care of all of your children's needs, you are working, taking extra shifts and arranging childcare. You have taken care of the housing, the bills and finances and amongst all of this you are even beginning to enjoy some time for yourself.
Being a strong woman does not mean being a controlling woman, that is just a narrative that some men want us to believe.