Life is ever evolving and ever changing, that's the only certain thing you can base anything on.
Life is like being forced to walk across the world. You MUST walk it, but you can pick and choose which places you stop by on the way. Avoid the bad and uninteresting places, and try to stop by places you want to experience. Even if you hit the bad places, you still walk passed them, it's inevitable, it's not up to you.
Point being - She dumped you and posted stuff on Facebook, and days have passed since then, it must pass, life keeps going. It's best to just be happy you are passed that bad stuff and are moving towards something better.
Also, drink a lot and watch South Park while blowing bubbles. It helps.