Feeling stressed

Ok yesterday my SO and I started talking about starting a family. Well to make a long story short there is this little girl that lives in the same apartment complex as us and he told me that the little girl was a test to see how I would do around kids and he said that I had failed. I don't know if that means that he does not want to have kids with me. Am i over reacting about the whole thing? After he said that I went straight to bed and when he came to bed all I could do was cry because it hurt so much to hear him say that I had failed at something. The little girl is about 5 or 6 and I just don't know what to think about what he said.