OP, I have read all your messages on this thread. I have not read what others replied, it's 11 pages.
My best friend was in the same situation. Lots of EA, no support with housework etc. She left after a long deliberation.
She has 2 sons, they were 14 and 7 at the time.
The older one was very angry with her for "breaking up the family." He went to live with his dad and never stayed with his mum again. Brief visits here and there, however no real reconcilliation. He has just finished uni, his attitude has not changed.
The 7 years old was having terrible tentrums whilst living with his mum. Somehow, he stayed with his mother. As soon as he turned 12, he went to live with his dad. (My relationship with my best friend broke up at that point, as her ex stayed friends with my husband - and she thought I was taking sides when I was not).
Her 7 year old is now 16. He sees his mum occasionally, he doesn't live with her.
My friend paid an exceptionally high price for her freedom. She is a practicing Buddhist, she found her way around the pain and rebuilt her life. She is in a new relationship now and is happy. She found a new equilibrium. My friend has accepted she made the wrong choice for the father of her children however this is not entirely her fault.
For the record, he ex is a proper prick, as far as I can see. Manipulative and lazy, however very clever and charming to strangers. She was and is a wonderful woman and mother.
For the record, I did warn my friend she might lose the custody of her children. She was always working full-time whilst he was in and out of jobs. Lots of women do not realise losing custody could happen. You are certainly not alone.
You said, your ex was making amends in relation to his EA. It has only been 5 days since you separated. I know I am probably going against the grain of this thread.
However, I am a very practical woman. I have been married for a very long time. My husband and I periodically go through times when we absolutely dislike each other to the point we sleep in separate bedrooms. In those time the only thing that keeps me in marriage is imaging my first Christmas as a divorced woman. This is always enough for me to discard the idea of divorce and start thinking what I need to do to improve my marriage.
Especially after what I saw happened to my friend.
I am really not here to advise you what to do.
However, based on what I know about my friend's situation, and on your posts, I think you need to give the idea of reconciliation a serious thought. Your ex is now hurting too. Being left is devastating to anyone. Getting back together might be easier than you think. Especially so early on, before he found another shoulder to cry on. Depending on circumstances, you might even get him to commit to marriage counselling to improve how you communicate with each other.