Break Ups.

How do you get over someone when you were so good together, and still have the potential to be. How do you get over someone who seemingly moved on so easily. How do you get over someone when your gut, which is never wrong, tells you it's not over for the two of you. How do you get over someone when even after 3 months and plenty of interest from other guys, nobody compares. 
I need advice. Seriously. I just found the girl who my ex is now seeing/sleeping with on Facebook and her profile picture and cover photo are of her and him, and his is of her and him too (damn he looked good this Halloween in scrubs. Probably because she's a nurse, lol.) it made me feel nauseous looking at it though. And I know, it sounds a little pathetic like I should move on. I KNOW. I'm trying. I have tried. But when you know the reason why you two ended things was in your control and it's something you know how to fix but couldn't find the words to do so at the time, it's hard. My intuition tells me that he's going to be a part of my life one day again, but I can't keep holding onto to this because I could be wrong. They say time heals all wounds but I'm impatient and this is hard and I just want him back and I want to fix things.