Hi Jen! I could have unfortunately written a very similar post. I don't have the issues with my Mother, but what your ex said to you is exactly what mine says to me all the time.
I have 2 girls and we split custody 50/50 and I also work full time. I left just after our 9 year anniversary. It's been just over 3 years since I left my husband and the JWs. You said: He told me what a horrible person I was. How I've ruined so many lives in my quest to be happy. How I've ruined our kids lives and they are going to be screwed up because they now are from not only a split home but with a religiously split house. He asked me if I felt like a horrible person because I should - and if I don't feel that way then I am a disgusting human being.
You don't know how MANY times my ex has said this to me. Over and over and over. He denies all the issues in our marriage and acts like I just woke up one day and decided to be "worldly". It's asinine. I don't know what your schedule is like and if you allow the kids to go to all the meetings with him or if you intend to celebrate any holidays. IMO, it will only get worse the more you try to teach them to be "normal". It doesn't sound like your ex would be okay with that.
I still have my family but they are all out of state and I only have 1 local friend. It's so hard to get everything done on my own all the time. I feel like I have to be on top of *everything* everytime something JWish comes up. I have to constantly combat the brainwashing it is of upmost importance to me as I have been disassociated by the congregation. I can't have the kids get baptized and potentially cut me off.
I'm going through all of this and it's HARD and I'd love to talk more. Feel free to PM me anytime. I need all the support I can get as well.