Caporegime
Yeah, it's a bit odd. To me it just sounds like she wasn't ready/wasn't over her ex. Or maybe she was using that as an excuse why things weren't working between you?
An ex is an ex for a reason afterall, so it surely should be a good thing that things were different with you compared to her ex? (If that makes any sense at all? )
Unless she was the dumpee, and never wanted to lose her ex in the first place....