What advice would you offer Person A, with whom you are very close, in this situation?
Person A & B were in a relationship for 2+ years. Person A is ready to get married and have kids. Person B envisions getting married *someday* and having kids *someday* but has been pretty clear that they aren't ready for this in the near future. Person A breaks up with Person B due to many many relationship issues, this being one of them, and moves out. Person B suddenly does an about face and tells Person A that they want to become engaged immediately, get married in under a year, and have children by around 2 years.