Single mom by Choice

Gi
I am 35 , an RN and been married for 8 Years with the Love of my life. We tried for 6 years before testing for any issues as I was 26, and he was 50 when we got married . Then we found out He could't have children Unless IVF due to sperm's quality and quantity. 
We tried IVF once and failed than he decided it is too too expensive to try again . He suggested  donor insemination and we both agree to go for it. I got pregnant on the second attempt but it was a blighted ovum. We tried again and we had a chemical pregnancy.
All of the attempts and failures put a strain on our marriage to the point where he asked me to sign a 
 legally document saying that in case we divorce or I DIE , he won't be responsible for my baby . 
It broke my heart and all of the months and events happened after that discussion ruined our love, trust and marriage. We are divorced now as I can't see happiness without a baby or until I exhausted all possible options. 
 I thought about everything I decided to chose Single motherhood as I have not time to waste, my fertility clock is ticking. What you guys think? Anyone has an advice or a story to help me ?