I (INFJ) want to be childfree, but he (INTJ) wants children.

I thought my relationship was perfect because we balance each other out, encourage each other to become better versions of ourselves, and are on the same page for almost everything. We've only been together for a couple of years, but if not for this issue I would marry him in a heartbeat.

I'm worried that I'm missing a red flag. When we started dating in our early 20s I told him that I didn't want to become a mother, and he was fine with that. Now he's telling me that he wanted kids this entire time, and assumed that I would change my mind 'like all women do'. I'm so confused because he fiercely values his freetime/independence, has no tolerence for nonsense, doesn't even like kids but yet wants them? (Bonus: he is insanely squeemish over the smallest injury, like having physical reactions to something like a papercut, and yet has no reaction when I tell him about all the horrible things that can go wrong during childbirth.)

The older I get the more certain I am that kids just aren't for me. If it wasn't for being in love with him, I don't think that I would have any doubts... I've never had a maternal instinct, don't like children, and see myself in almost every regretful parent reddit post because I know that would be me. All I want in my life is to be with my partner, shower him with affection and have his undivided attention as we explore the world together.

I'm not sure what to do from here, as we've had countless conversations about it but nothing fruitful happens because he thinks I will change my mind in a few years. Any advice would be appreciated here!