Let it go man. Focus on yourself. You are looking for reasons to justify insanity ad it will hold back your healing. Those reasons are hers and even if you find out what those are it still will not bring you back together. Move on, it takes two to make a relationship work. Love yourself and improve yourself. Dont neglect the relationship with yourself. You are trying to find something that is broken with you…Dont…Just because the relationship is broken does not mean that you are. Let it go…you are just making an excuse not to move on by holding to that question…Let her go…she will realize later in time what she has lost and you cant force her to see that…Sorry about that however hard we try, we cant force others to love us….