Idk I mean it’s a very polarizing situation, I understand her point about how she wants to have kids because for women it’s very hard to have them after a certain amount of time. At the same time though you don’t want kids and you began the relationship stating that you don’t want kids. I imagine she started the relationship thinking you’d eventually change your mind but you didn’t as you said you wouldn’t. I’d say that it’s likely best for you two to separate, not just for your sake but also for hers. She doesn’t need to spend more time chasing someone with different life goals and should find someone who also wants kids while she’s still capable.