Ok, i'm just gonna throw in a few random quotes here to help defend him. you can perceive them anyway you like. I take them as a nice/caring guy moving on with his life, but you can take them as a heartless asshole if you choose to:
first off to counter your quote:
" no reflection on her, just questioning my own motivations. I'm not suffering from remorse, in fact I don't feel like I'm suffering at all - that's what's worrying me."
Now to defend my PoV:
" I don't want to be cruel, but I really think the relationship's done."
Re the h0t blonde:
" Do I suck or rule? I'm not sure."
" I don't feel bad for hooking up with the other girl, but I hate myself for hurting the ex. Even though the relationship was done, I still care about the girl. God, I'm a fucking horrible person... "
" I don't like making enemies, but I do take other people's feelings into consideration so much in my everyday life that I rarely end up doing what I actually want to do. Last night, I did. And I'm paying for it. "
sounds like you're reading what you want to hear.
some more quotes:
" I've managed to stay very good friends with all of my exes bar one, and I'd like to stay on good terms with this one."
Anyway, thats my official stance as carecrew commander. You're reading only half of what he says, or are just choosing to ignore the end portion. Sure, it sucks he's moving on so fast, but if you read what he posted, the relationship started to die a long time ago, so he basically got over you a little bit at a time long ago, whether you did or not is another story, but you shouldn't blame him for being ready to continue with his life without you so quickly, because for him, you started leaving him so long ago, his mind was ready for this and it wasn't much of a shock.
edit: in reality what i'm saying is: he's moved on, you haven't. But he still is trying to care for your feelings, the problem is, you haven't moved on and your feelings are excessively frail right now, plus you hate the thought of him moving on. But in all of his posts, he expresses concern for you, a desire not to hurt your feelings (except he's decided to think of himself first for once), and overall regret at not being able to maintain a friendship with you like his other exes.