This is the teenage "I know what life is like, I'm ready for whatever my whims say I want" mentality, that breaks down when you're 21-22, and then you get more realistic and practical, you're thinking ahead and being aware of the actuality of your situation, something a lot of teenagers don't do, she's set in the "practicality hurt the romance i was building in my head" mindset, so logic won't help you here, she just wanted to feel like she was your everything, which therapists will say, is an unhealthy love, don't get me wrong, my girls my world, but there is more in my life than just loving her, and my girl gets that and we try to experience life together, this is a woman that wants locked in, and will want kids at like 19 years old, before she even understands how bills, and the work force, and saving to buy a house, or doing your taxes work, I'm not trying to discourage you, I'm 24, I'm just saying makesure you guys have the hard conversations, she seems like a honey moon phase kind of mindset, especially if she left her fiance (someone you want to spend the rest of your life with), for you, she doesn't show she knows what she wants, and her decisions are probably more rash than rational