Some Old Wounds Never Truly Heal

My ex girlfriend posted a picture of her with this guy she used to date called “E” . It still makes me sad that things didn’t work between she and I. After we broke up, she dated two other guys, and I know it sounds stupid but deep inside I was kinda hoping she would come back to me in the end. Instead, she is hanging out with E and I’m not even sure she broke up with the other guy yet.
I know that she is not worth the heartache but a part of me is still crazy about her.