I have an amazing girlfriend but i am loosing her. its my fault and need to redeem myself. whats the best way?

Listen to what she is saying. Sometimes guys don't hear when a woman is telling them what is wrong. Go to her and tell her you love her and you don't want to lose her. Tell her what is it that you can do to make things better. When she is talking listen carefully and do what she is telling you to do. If you show her that you are sincere about the relationship you can save your relationship.