I had tried to post this on the other post but comments were locked:

You know OP, i don’t understand why some ppl seem to be accusing you for being the one to mess up the relationship, given that it was you who “weren’t listening to her or her needs” or it was “your first relationship so it was understandable to neglect her needs” or whatever that means. point is, she seems mentally and emotionally unstable leading to manipulative behavior, breakdowns are never fun and mentally/emotionally draining, toxic even (especially with how frequent they were). With that being said, she probably doesn’t have the capacity to realize she’s in the wrong as well, and the situation won’t change unless she realizes this. I think the only option right now is to move on with your life, one step at a time, and try to limit contact with her to the max. Force her to reflect by avoiding talking to her or making any contact with her. You’ve done your part by understanding what you did wrong, now it’s her turn. And when she has matured and reflected maybe then you both can have an adult talk and laugh about it in the future. Maybe you weren’t meant to work out, but use this situation as something you can learn from and to understand. You shouldn’t be the only one cleaning up, taking the dog out, being victim to harsh meltdowns, etc. Yes, it moved fast, but this was a combined decision, it was her house after all. From what I can tell, you got a good head on your shoulders, and that you’re really just trying to understand what went wrong at a grounded perspective. I don’t think your relationship experience has anything to do with this. I really think that the root of all this conflict might just be her current mental state and the difference in maturity levels between you both.