If any long-term relationship is going to last, the couple needs to be in agreement about questions regarding things like where they will live and having kids. The latter in particular is something there has to be mutual agreement on, otherwise the relationship is going to be particularly unhappy for one of the partners.
A 57-year-old man with criminally poor self-awareness asked the internet if he was a jerk for ditching his girlfriend of 25 years because she was menopausal and he suddenly wanted kids. People online gave him a reality check and told him exactly how horribly he had screwed up.