I'm sure I would fit into that book as well. Withholding emotion? Ignoring you when you want to work things out? Sweep problems under the rug and pretend they didn't I? I wonder if I would make it out of the introduction before being labeled a loser heh.
However it's not impossible for him to change. Being the one that dumps you, yeah, it isn't as likely he will change because when you do it you see the other person as the problem, they were the one bringing you down, they were at fault for everything. Being the one that is dumped, you feel like you were at fault, you ****ed up, and you are the one analyzing while he is the one forgetting. I was dumped too, but I brought that upon myself.
Anything you try after he pulls the trigger is just going to push him away more. He is trying to forget it by ignoring everything you say. Hopefully his decision won't turn around and bite him in the ass later on in life. I bet you you'll get an apology later on if it does happen for all of his selfishness and antics.
You did give it a good effort and you are a better, wiser, and stronger person for it. Take the good from this and forgive him for being immature and selfish. Get your stuff back and get some time apart. You don't want to be at 5 months and still be wishing for them like me when the ex is dating somebody else. Trust me.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.