Black-out can happen on both sides. Whenever there is anger involved that becomes rageful there is very often a distortion on what is happening. You saying she has had a blackout when you were as engaged in the process as she was might be inaccurate — as much as you might think or convince yourself it is.
You explaining your version to her when she feels threatened by what happened is not going to help. A person who feels threatened and afraid of someone who has broken ties with them isn’t looking to be told how inaccurate their memory is of the situation. Being told that they are wrong about what they are feeling, don’t have a need to protect themselves, and were really the person at fault for causing it is exactly the kind of approach that tries to shift blame rather than taking responsibility for your part in it.
The “c-word” is verbal violence and part of exactly what is studied when they look at intimate partner violence. What you’ll need to focus on is your verbally abusive reaction — not her response and your interpretation of what happened. Trying to convince her she is wrong for protecting herself, that your interpretation of what happening is more accurate, and that she blacked out don’t get to what you need to do to help yourself and future relationships. The primary work on your side of the coin is to figure out what your other options are and what you can do to exercise them when there is a heated argument. How can you control your verbally abusive language during an argument? What prevented you from getting out of the car when you were punched rather than your reaction? These two things are where the work is — not trying to convince her that she is wrong for protecting herself because she blacked out.
I’d highly recommend you check out your reactions in individual therapy. The Find Help tab at the top of the page can help you find someone in your area who specializes in anger management.
Wishing you patience and peace,
Proof Positive Blog @ PsychCentral