My husband is childfree. We both agreed on it. 5 years later, he now wants kids. Anyone been in my situation?

Not sure how to feel. My husband was always against having children. It was one of the first things he told me when we started dating. I was OK with that. I have several reasons why I don’t want them. I always felt good knowing we were on the same page, and that we never had to argue about it.<br><br>However, lately he’s had a change in heart. Almost out of nowhere. He believes our lives aren’t complete without kids. I’ve been trying to convince him otherwise and give him reasons why, but he simply will not listen. I feel like talking to a brick wall. I feel like this is a conversation we should have had 5 years ago, before we committed to marriage. I don’t know what to do. Break up with him? Try to talk some sense into him and risk sounding mean and controlling? I don’t know what to do. <br><br>How would you feel if you were in my situation? Any advice?