@Badger2012,
Block her on social media and try to stay away from places where you could just so happen to bump into her. Yes, you've got to change your life a bit, but that's because you're the one who's hurting.
She can't just pop into your life 'somehow' unless you are making it possible/easy/upping the odds of a coincidence happening. If you work in the same company, it may be harder. But otherwise, yeah, you go to different bars or grocery stores or whatever.
And while you are doing that - because you're going to change a few things about your life - meet some new people. Just, say hello, small talk, silly stuff like that. Be approachable to other people.