I broke a girl's heart? This girl has been cyber stalking me for a while and I thought she was just competitive. I recently got a new boyfriend and now she's a mess I don't understand why she cares.

I don't think that you can understand. No one knows why people do what they do.

I'd say ask her but if she is making you uncomfortable why have contact with her at all? Delete her or block her from everything. Move on.