I don't understand my feelings

I love my SO I would NEVER leave him.

Been together 3 years, we've kinda planned our life out. Buy a house, get married, start a family all that stuff.

And I found out he's no longer able to produce sperm as of a month ago because he fell sick and yeah. Long story short no babies. I'm so sad I want to be a mom to HIS babies. How do I handle this?

I'm also sad because he's already got 2 kids from his previous marriage so he's got kids I've got none. 😢