Here used to read that this thread is suitable for confessing things. Whether it is something shameful, something you're secretly proud of, or both, here is where you may confess it.
This happened a long time ago, but I feel the need to say something anyway.
This is what my friend Kc said when I was sobbing over a break up. (I felt almost exactly the way you did, only with added guilt because I was the one who ended it (I had to, I didn't want to))
I know right now it feels like you'll never be happy again, but you will feel better. And you'll feel better much sooner than you think you will. It will be horrible for a while - maybe a week, maybe a month, maybe even a year. But someday, you'll wake up one morning and remember how you used to be. And you'll start looking at new people, and thinking "Oh. He/she's beautiful..." And you'll fall in love again. that's just the way the world works.
It is by far the best thing anyone has ever said to me while I was sad, and it's true. I hope you've already hit that point where everything's alright again.