Most Helpful Girl
I think that until you can understand and appreciate why she left the relationship, you won't be able to maintain a relationship with her. It doesn't sound to me like you take her perspective very seriously. You sound quite dismissive of her actually.
Give her space and time. You need it too. I think you need to work on yourself a bit because it doesn't sound like you are all that mature or considerate. Try and be a little less self-absorbed (because it sounds like you are - from this short description anyway).