Why won't he let go?

I broke things off with one of my best friends, because although we have a shload in common, and although we get along well most of the time, I became painfully aware that he is never there for me when I need him (I have been for him) and he chooses lies and excuses over cowboying up and doing the right thing when it’s expected.
Now that I’ve put this plan into motion (not instigating contact, not answering his calls, dropping his accumulated crap from my place in his driveway), he won’t let me end everything and is trying to turn the situation around so he is the victim. He just doesn’t get it.
He has an excuse for everything. I asked him (since he is right now in a better financial situation than me) to get some concert tickets for us and that I would pay for mine the day of the concert. He said, “You’ve done that for me many times, so yes. I can definitely do that.” Two days before the concert, I hadn’t heard from him in the better part of a week, so I sent a text that let him know I’d figured out we weren’t going to the show. I still heard nothing from him and after 24 hours passed, I sent another text that said, “Nothing, huh? Okay, I can take a hint.”
3 hours later, he texted me and said his phone was lost and he didn’t get enough on his check to pay his insurance and buy the tickets. This was an hour before the concert was supposed to start. In my view, he proved to me once again that he’s not to be counted on. He says I overreact and I’m taking this too far.
I need to know: What is his damage? Why won’t he let this all just deflate quietly?