Fiancé doesn’t want a second child

We have a son who will be turning 2 in February. After I had him we agreed to have 2 children close in age. Around 4 months ago I brought up the subject trying for another baby and he flipped out on me. After promising me 2 children he’s completely against it and won’t even talk to me about it. Every time I bring it up it becomes a huge argument. He said 1 child is enough for him not even taking my feelings into consideration. It breaks my heart because he lied to me and won’t even give me the time of day to talk about it. I love him don’t get me wrong but I just can’t marry him after this and I’m really considering leaving because of the way I’m being treated over it. Idk maybe I’m overreacting what would you ladies do in my situation?