Ok I admit 2 things, which are probably gonna sound pathetic but well :
a) I want to delete her so she never has a chance to delete me
b) I know it'll affect her (she's super-sensitive) and of the 3 exes she had before me, she only pines for the one who dumped her (and caused her the most emotional hurt). So the twisted part of me wants to dish her back the immense pain she has caused me so far (she's the one who dumped me and also the one waltzing in and out of my life, sometimes friendly sometimes no).
Do I sound like a jerk?

A very hurt jerk actually.