Have my baby's or there's the door comment!

Melissa • 33 yrs old I have two wonderful boys and one beautiful step daughter. I`m a nurse and going to school to become a PA.
Ok so let me know what you honestly think. 
I have been in a serious relationship for about two years and recently engaged. I was a single mom of two boys for 12 yrs and had one five years relationship before meeting my fiancé now. My fiancé has a 13 yr. daughter (good girl but raised with no mother) now that my fiancé has the relationship of his dreams (So he says) he's asked me to give him two kids. Well I have a 13 and 12 going on 14 and 13, so my baby years are done to far long for me to have ever thought of having another baby. I knew before we became exclusive he wanted more children and I was opened minded to that. Being with him these past years I realized we have different views on parenting. I disagree with his and he can't agree that I'm a better parent. With all this being said, I mentioned to him that I'm going on 35 and have no interest in having anymore children. He replied and said "There's the door".! "You know I want more children". I'm not sure what to say. Ummm his parenting sucks and I'd be the one always doing things alone with this hands on baby! Tell what would you do! Thanks