"Solving the simple problems that should be so easy but aren't because i don't know this language well enough to know it's idiosyncrasies" - my friend

Can't find a way to paint this picture so I'm not the villain.
Or at least a selfish ass.
Most of the people that have been the closest to me have left me over the past year. I use people. I must. I use them indiscriminately, and I know it's wrong, but I pretend that it isn't because they don't say anything to me about it. Well, they do, but only after they've left. Or while they are leaving.
I try to pretend it isn't my fault because while I was fucking them they didn't say "HEY NO THIS IS NOT OK." I pride myself in my honesty and how honest the friends that I choose tend to be. But really, is it honest if I'm expecting from them what I myself would not do?
I thought Pants had left, but I realize now that I've just been blocked. He's blocked me, and like other people I have loved, he's left me. This silence is a loud and ringing message. He once said that he doesn't think people really change. I tried to argue. I said that I have changed. I have! But at the core, am I not continuing those same horrible patterns I used to trod when I was 15?
Stop treating people like they exist only to serve you.
This is so difficult. Interacting with people involves dances that I never learned and haven't had much reason to attempt in the past. But now everyone that used to be ok with my clumsy steps has gotten tired of getting their feet stepped on so they've left. And I don't blame them. This is not a "how dare you" it's a "how could I?"
So what do I do now?
I don't believe there's any way for me to repair the relationships that have been torn. I don't say that because I wouldn't want to make the effort. I say that because the people I have hurt are already beyond repair in terms of their dealings with me.
All I can do it learn from this, right? Use the knowledge to help me accept the things I've found to be inexplainable in my previous loss. I understand now. Can I use this information to help me avoid future grievances? Can I cease this ignorant behavior?
I hope so. I have to. I can't go the rest of my life plowing through good people. I can't be ignorant to my own actions.