Boyfriend might want kids. Would you tolerate childfree ultimatums?

Title kinda says it all. My boyfriend (M27) and I (F24) have talked about kids before. I have always said no and I don't think I ever changed that. He was perfectly fine with that. However, today he came up to me and said he might want kids. He didn't specify if a child of his own or adopted but he didn't seem to be leaning towards either option. I asked him what made him think like this. He said his young siblings growing up.<br><br>I am worried I am gonna lose him. I don't want kids. I would rather die than have a child. I know that Adoption and Surrogacy are always an option but I don't want to go that route either. I don't wanna be a mom. I don't wanna be tied down. I don't want my life to change. And I don't want to be responsible for anyone else but myself.<br><br>I asked him if he knew what his thoughts on kids were, why did he even date me at all? He said it was saddening to hear me say that because he thought he could trust me with anything at this point. I asked him again what made him think about kids again and he said maybe he is just nervous about being older. I said, you're 27. And you're already questioning whether you want kids? You're still young. You have plenty of time to figure it out.<br><br>Then he asked me. Would you tolerate staying with me if I want kids? I said no. And I elaborated that I would allow him the freedom to figure things out but I can't promise we'd stay together.<br><br>He left the house and I haven't seen him for awhile. I don't know what to do. We've been together for 4 years and I don't know if I can let him go. But I also can't compromise on the kids issue.<br><br>What should I do?