Delayed reaction

I'm so rediculously heart broken. I don't understand how the ex can seem to move on so easily. I try not to think about it during the day but everything reminds me of him. Someone told me that the best way to get over a person is to concentrate on all the negative things about that person. I can honestly say ... there weren't many if at all. I've never had a broken heart before and it hurts so much. I'm just so sad and balling like a baby right now. Anyone been in this situation? I've always been strong but I just want him back I want him to hold me and tell me it was all a dream. I just don't know how to deal with this. I know it happens all the time but it's never happened to me in my life thus far and I don't know what to do. My heart is bleeding. I feel like nothing can take this pain away.