I left my ex when ds was two. A lot of other reasons but also Ex expected me to give up my 25 year career, wouldn’t help with ds or flex in any way.
We’re 9 years down the line now. I’ve worked full time, and had ds most of that time. Ex sees him every weekend for a few hours which they both seem content with.
In 7 years of school, ex hasn’t done a school run, a sports day, parents evening, docs appt, dentist or Hosp run. He says “he can’t because he works”. Ignores the fact that I do too and yet I manage. So I see it from the other side.
Every couple is different but there is no reason why your little one can’t have a stable and loving relationship with both parents. You have to find a way that works for both of you. My ds is a happy exuberant boy. I work hard to ensure he never sees us argue. Focus on giving him the best I can, and ignore the rest. It takes effort but it can be done. Good luck.