Sorry, Wrong Num-Num

I love my boyfriend. We've been together two years. Recently, however, we've been experiencing conflict over the issue of children. He wants kids; I don't. I've always felt strongly about this, and he said he was fine with this when we started dating. But he's been bringing up the subject of kids a lot lately (I suspect because he's thinking about popping the question). The discussions have grown fraught -- to the point where he was in tears at the end of an argument. I eventually said I could b...