Just have to add that the whole "if you loved me" is pure manipulation.
"if you loved you'd fall on a sword for me"
"if you loved me you'd let me keep taking advantage of you"
She knows that by dredging up the past she can get you to defensive and asking for forgiveness, once she has the moral high ground on you she can push you into positions you may not agree with.
The reason she keeps bringing it up, is because it is still an effective strategy for her.
Stop apologizing for the past, next time you feel like using the word sorry in front of her, say this instead, "don't worry, you won't have to deal with this situation soon". Or "boy things are screwed up, good thing we're ending this huh?" smile then step back.
Seriously drama is her weapon so disarm her, laugh, be playful, don't get sucked in anymore.
Think of a pit of despair your W has all sorts of nasty weapons stashed down there which she can club you over the head and win with. Yet in order for her to use them on you she has to either lure you, or outright drag you into the pit. In fact you may even think that you are jumping in the pit to help her get out. That's not how it works though.
She needs to get herself out the pit, and as soon as you giver her a hand she'll just grab you and drag you in. Remember that's the plan. On the other hand if you just keep walking, eventually she'll get tired of waiting for you to fall in there with her, and pull herself out.
After she realizes the strategy doesn't work anymore she'll stop, because it's not fun to sit in the pit of despair by yourself, especially if you can't use it to drag someone else in.
