Aww Matt, this place is for anyone's problems... problems, happy stories... anything! And yes, any difficult things as well.
I'm sorry, that's a really tough situation. And it is really hard to try and start a new relationship if you have such strong feelings for someone else who's very much in your life. Just try to give yourself a little more time, you know? Listen to your heart and see how you feel... maybe after a little while, you will be fully ready to start a new relationship. But, always try to follow your heart, and see what you feel ready for. Try not to feel too badly, though... you can't help how you feel.