I know how you feel. I have a certain x that I've not even seen for almost 15 years and I still think of what could have been. That being said, I've moved on and I am now married to a wonderful guy.

You say you don't think you could love anyone else, but I promise when you find the person, you will love them. I look at it like having children, you love the first one so much you don't think you could possibly love another that much, then lo and behold, you have another and love them just as much as the first. Give yourself time and I am sure you will find a new love. And there's nothing wrong with continuing to love someone after you've split, just be realistic with yourself and don't be so hard on yourself about "losing" him. You never know, you may meet the greatest person ever tomorrow. Good luck!