If you have kids, have you positively celebrated the developing pregnancy(s) and then birth(s) with your partner(s) at the time?
With my first ex I did try to and was involved, present and actively participating each time (three)
Second ex wasn't interested as I was cut out of the relationship from the day she found out she was pregnant with our daughter.
All four of my children have been c-section births though. I've never got to experience or be part of a natural birth.