A previous ex that wants to reconcile. Maybe she's changed. Maybe not. That's for you to find out.

The breakup was her idea in the first place, however.

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Here's some exposition that you don't really need:

She was your girlfriend, but you had a falling out, which lead to the breakup... plus the fact that she wasn't the best of partners. I mean, you yourself weren't perfect, but you also weren't overtly jealous, high-maintenance or quick to insult. But then again, her issues did develop due to her past experiences, so can you really blame her?