I want another baby but not with my fiance.?

Your feelings are both normal and not rational. You want another person in your life to love you, whether it be a new fiance and/or a new child. You have plenty of time and two beautiful children already. It is not healthy to bring a new child into a volatile relationship. Once you fix your situation, then you can consider having another...you have PLENTY of time. My grandparents did not start adopting until they were in their 40's!