y pictures from an EX?!?

You stopped chasing her and she misses the attention, so now shes back to figure out why you aren't interested in her anymore, whether you just moved on, have a new g/f or what. The picture was nothing more than a ploy to respark your interest in her and dangle hope in front of your face. Sounds like you're handling it good, playing cool and not being bothered by her, that's how you play the game my friend. Good luck.