<human>: Can you provide a brief rundown of the text in within 3 sentences?

My girlfriend and I have continuously throughout our youth done the on again/off again thing.  We always wind up finding our ways back to each other because we both haven't loved anyone this much.  The problem we're facing at the moment is the biggest one we have had over our time and I am nervous that we won't be able to get through it.

The last relationship she was in prior to our present stretch was a bad one.  The guy was very manipulative, and both emotionally and physically abusive towards her.  It took a lot of time for her to open back up to me and for us to rebuild our relationship after that one.  There are still portions of that relationship that she is reluctant to open up to me about and I respect that and don't push for more.

Anyways fast forward to last weekend we were at her cousins wedding and both of us had too much to drink.  She asked me to go sit down as I was a mess on the dance floor and instead of complying like I should have I started an argument.  Not to alarm the others we went outside where I proceeded to become more and more belligerent and defiant towards her wishes that I calm down and relax.  The fight continues, she storms off, I go back to the room.

I woke up the next morning not recalling any of this and had to have it retold to me.  She said that I had promised her a million times that I was not that person, but it seems like I lied.  This was 3 days ago and both of us are a mess.  She says she doesn't know what she wants to do about this and had never been the most firm decision maker.  I have apologized profusely, sent flowers, given her space, and I have also decided to act proactively and go speak with someone about how I acted under the influence to see if there is a bigger problem here.

I just don't know what to do, I can't stand the thought of losing her after all we have been through because of my drunken actions one bad night.  Please whatever advice, etc. any of you can offer up to help would be immensely appreciated.
<bot>: Long term on again/off again finally going well for about a year, one drunken fight scared her, and now I'm doing everything I can to keep her.