As someone who suffered this sh*t, I can tell you that you WILL get over it. I was bitter, I felt I couldn't bounce back, I was obsessed with thinking about everything that happened. Then she got pregnant with another man's baby - my biggest fear - and a few weeks later deleted her from facebook.
Anyway, that was a big step for me. But the biggest help is distance from them..just stay away from her. Don't rush into dating if you're not ready, just talk to other girls, flirt, and enjoy their company. Trust me, it's been six months for you now - give it another six months and you'll feel way better, give it another year and you won't care in the slightest. Just avoid contact, if you can keep a little eye on her social media, you will see her play little games, you'll notice that if she gets a boyfriend certain SM will be devoid of any images or mention of him, whilst others will be all about him and her.
Just remember that every day you ignore her, or avoid her is a day where YOU are recovering. Theres no rush to do anything, just take your time and you will get back to your old self - or an even better, stronger new self. You've simply taken a nosedive in self-esteem and are insecure.
Just for context - she ended things in June of 2014 - It's now October 2015 - I'm as clear headed about it all now as I've ever been.