Um, are you really sure you verbally abused your girlfriend in the first place, and, if you did, was it really "for the whole relationship" up to that point? Is her claim to being verbally abused by you really justified or have you accepted it because of other reasons?

I ask because someone who is abused, in my opinion, isn't able to become as abusive as she has 'just like that'. What I'm suggesting is maybe it has never been you who is the abuser.

You may want to take my comments with a pinch of salt as part of my issues now, having recognised how abused I've been, is feeling very sensitive about manipulation, and it sounds to me as though your girlfriend may have manipulated you into feeling such guilt in order to undermine you to have control over you. It's one technique I have been subject to, so much so I couldn't tell which way up I was, let alone whether I was in the wrong or right, not that I was ever in the right, of course(!) If there's a grain of truth, and I mean 'a grain' (such as using a 'same word' in a whole sentence of 'other words'), it's really easy to convince someone with very low confidence/self esteem, who's been worn down (maybe subtley - you say the emotions of the relationship are amplified and have drained you), to believe they have said something that, quite frankly, would never, ever enter their head to say.