Come on, bartender. Won't you be more tender?

I recently learned that I'm going to have to show more patience toward love. For the first time in my life, I was dumped---hard core: I didn't see it coming, I was still very invested in the relationship, and he suddenly felt like I needed to be "just a friend" (*cough*bullshit*cough*). I've been so completely disoriented from this experience that I've had a hard time wrapping my brain around it. How could he be gone? How could he just leave me in the dust like that? Why do I still have these occasionally overwhelming feelings in his direction? Ugh.
So, what have I done to cope? I've made it a point to completely erase the man from my life. I only knew him for about 3-4 months at the max and our relationship didn't even last a full month. Therefore, I feel justified erasing him fully from my life. Why do I do this rather than befriend him like I have every other ex-boyfriend? Because I'm still invested emotionally in him. I can't just suddenly look at him with friendly eyes. I still want to put my arms around him, squeeze him, kiss him, enjoy his scent. It's not fair at all to me to have to pretend I don't want to do these things while hanging out with him. So the alternative is acting like I never knew him, never met him, and never made out with him. Sucks, I know.
I guess, now I understand guys feel when a girl breaks up with them "out of the blue". I know how Robert felt. I've been asking the same questions over and over in my mind: asking myself what I did to turn him off from me, how I ruined it, or how I ruined him. I can't cry, either. I cried last night, but only because it was provoked by Finding Neverland (damn you and your sadness). I still don't understand and I don't expect to ever understand. All I know is that its time to forget about him and move on to the next victim--as we always do.
So, tell me, is it wrong that I've erased him from my life? Is it immature to never want to speak to him and see him again?