Friend zone dilemma

Hi, I met that girl 4 years ago, we dated for like one month, after that we broke up because she was still in love and trying to get back to her ex. we remained friends since then. Actually i enjoyed being friends with her but maybe because i somehow still have feelings for her. i lately started to feel that she is taking me for granted (the typical friendzone issue). 2 months ago she did something that i didn't like, and i went radio silence on her. and she didn't contact me neither. but we are still friends on facebook. my question is: does it make me look petty if i unfriend her on facebook?