Fertility window closing and I’m scared I’m going to make the wrong choice, any other childless betrayed?

We were set to have children this next year after being together for 10 years and I've found out all the cheating, my fertility window is closing and I'm feeling panicky about choosing to stay and have children with a cheater or run away and start fresh? Anyone else having this internal struggle??? It's not fair he doesn't have to worry about this as he could procreate for the next few decades still:( all makes me so sad and scared.