I know how you feel, I went through a bad breakup earlier this year. And I wouldn't wish the feeling on anyone; because it's horrible. Especially when this is your best friend and you feel as though they're leaving and moving on and nothing they said ever mattered or meant anything.
I know it's the last thing you'll want to hear or believe; but it does get better. I know this is cliché advice - but cliché advice is only cliché advice because it's true.
It starts out really bad, because a huge part of your life and time is now gone and you don't have anything to fill the gap with. So start filling the gap, take up new hobbies, go out and socialise, fall back on the rest of your friends, spend more time with family and so on.
Slowly but surely the hurt will become less and you can move on with your own life. Personally I found the hardest part to be when I started looking at their social media sites and watching them move on with their life and wondering how they could do that to me; when you break up you usually have the victim feeling in the situation; but remember on the other side is a person with feelings and needs and a whole entire different view of the world, and this is what they needed.
Sometimes things just don't work out, and I realised that as impossible as it seemed, it was always possible to slowly feel better about it and move on and be happy with someone else.
That's another large in part why I don't have social media. If she had created one I don't want to stumble upon it. But what people don't seem to understand it's not just another break up because she was my best friend for literally my entire life. I guess that's what I get for dating her though.

















