Nicole - I don't know if you've taken a moment to reflect on your journey, and so let me quickly do it.
You went from a H who left you twice, with the last time ending up with some young hussy in Dubai, with moving from a dream home to a small apartment, with having serious health problems that made life let alone parenting very difficult, with not having proper employment, with all of this contributing to a miserable life - TO - surviving all of that with strength and resilience; moving cities and landing a job that you're good at and can make a great career out of; creating a stable life for your D; improving your health and becoming self-sufficient; and showing poise while your H continues to wreak havoc on his own life with implications on your D.
I know I have definitely missed the smaller details, but just look at that. You did this in a matter of many months, and I am sure they were long. But look at where you are now.
So, be confident and hold your head high. You've accomplished so much. Show the same grace and poise in face of H's madness and continue improving your life. Don't back slide and don't take him back easily EVER.
In Hannah Gadsby's latest stand-up on Netflix she said - "there is nothing stronger than a hurt woman who has rebuilt herself". That is you. Keep moving forward and one day you will have a partnership with someone that deserves you.