I honestly think you're wasting your time brooding over this situations.
Love relationships, whether they are short-term or long-term, are meant to help us grow, not to ruin us.
I can't judge her behavior or yours. You're adults and as such you are free to choose how to act. But, if those actions cause more pain than joy, what's the point? Some people get the best in us; others the worse.
It is up to each one of us to choose who we want to be with and what we want to become.
Relations, no matter how long or important we think they are, can end and sometimes they must. It is the healthy thing to do.
Pain, no matter how deep or piercing we think it is, will go away.
If any lesson is learned from the failed relationship, then better people will come your way (and hers). Life is about reading people and making the right choices at the right time.
It is a pity that social media is somehow the center of this problematic relationship. My guess is that millions more should be going through similar situations. Maybe it is about time people learn to handle social media in ways that they can contribute to their relationships and not to their endings.
It's not the end of the world. Just move on.
I tag @vascovieira, @snowy-june, and @nancybriti