I hesitated for a long time if I should participate in this discussion, but now...
I was in a very, very similar thing about 7 months ago. I was wallowing in self-pity for hours over hours, finally a couple of days. But then, I saw that it didn't help my at all. Besides the self-pity I was feeling to myself, there was no way I possibly change a thing.
Actually, you can even find these days when looking through the history of the forum. It was the time when I posted like 12 times or even more a day, had Deck ideas all the time, I started playing MtG again. I was trying to distract myself with things I actually abandoned because of the relationship. I was trying to regain the same status as before, but with more experience gained. Even weeks after that, I still felt the pain. But why wasn't it so bad anymore? Because I at least tried to accept it, even though my mind (heart, or whatever) didn't want to. I stopped listening to the music that connected us and so forth.
I know that my English actually isn't quite good ( in fact I think it's pretty horrible compaired to my German), but I still hope I could have drawn the picture of my situation, of my past situation well enough. You don't have to be like "Try some new stuff, let's do some Bungee-Jumping and go to a party after that", no certainly not. It's much easier to let the change happen slowly than block your own feelings and try to hide them. Like that, it actually takes a much longer time to get over it.
Now, when I look back at these times, when I play some of her favorite songs on my guitar, I remember it being a wonderful part of my life, because I really went over it. And that's what I'm hoping you to do too.
I hope I was able to help.