Wow. That is a big deal. Do the two of you have agreement on other values? When we get involved with a person. ideally, we get an idea of what the two of us want in life. Having kids is a major issue. But it’s not the only one. If you have time, you can think about this. Ultimately, you got to go with your gut. Imagine your life in 20 or 30 years. Is this what you want. It might be a good idea to put this aside for a while and see how you feel about it in your gut. Also, I would look to see what are the things the two of you still share as goals. Find out what his goals are. If he changed this goal, did he change other goals. Take time to find out what you need and what he needs.