Seeking expert testimony is a sign of strength. A personal relationship with a caring professional is proven clinically effective.
I believe that I can help with this situation.
It does not look very hopeful for this relationship, according to what you have said.
Getting back to the way things were when you first met her would not do any good if you have not learned to changed your manner of communication.
A year ago you had not yet begun to communicate with her except in a very cautious way that new relationships start off.
We don't show all of our cards at first and because of your communications problems which alternate between you being argumentative (as is she) and going silent (which a lot of ment do - it is the retreat to the cave).
At this point, if you want to save this relationship which seems as if it is teetering on the edge of destruction, then you must seek immediate outside help in the form of a seasoned and intelligent licenced marriage and family therapist (LMFT) who can help to quickstart your communication, and have you two talking honestly with each other, while finding the best ways of communicating with each other.
I also recommend that you immediately purchase and start to read the very best and most effective book on family therapy that I have ever read or seen.
Communicatin is the backbone of relationships and you must improve that immediately.
Here is the book that I have in mind:
The best hope is to start working on yourself. Try to buy some time with your girlfriend, go to a therapist and get this book and begin learning how to remake yourself.
If you can do these things and start showing REAL improvement by working on yourself, then you can save this relationship.
I shall keep you in my prayers for strength and commitment for trying your best.
Elliott, MAE, LPCC, NCC, CCMHC