Time is the only thing that can heal stuff like this. You think that of your ex now but at some point in the future this will all be in the past and there will probably be someone else. I think he did you a favor by blocking you because that's what you need to do, painfully break the cord and let your brain move on. But right now your brain in zoomed in on him, with a certain chemical mix that makes it impossible, our brains love to want what they can't have and they love to feel emotions so you keep relieving the movie in your head and feeling the pain. Women also dislike easy men that are not a challenge. So really your brain is stuck thinking about the past and will head to depression, you need to try to make it think of the future without thinking of the past which is pretty hard, good luck.