Or maybe she:
- wanted to feel less guilty and did it to make herself feel better
- just wanted to have everyone see them getting along so she couldn’t be blamed as the villain later if people found out that they used to date?
- is just an airhead that doesn’t understand that he was actually really hurt by the breakup
She made sure that nobody knew about their relationship for how long? Don’t go pretending that she cares about his feelings now.
He did NOT want to talk to her again. Being treated like everything should be fine and that she didn’t break his heart was painful for him. That was pretty clear.
Without getting her PoV it’s impossible to know what her intentions were. I’m inclined to believe she’s good natured, but also an idiot and emotionally under-developed.