It sounds like his biggest mistake was in saying it was okay for you to live there when it really wasn't. It would have been much better to say no right off the bat, but maybe he wanted to make an effort to be helpful?

I would have a hard time letting any of my siblings move in with me, especially with a significant other. Being a single person living with a couple is really hard. Living with a sibling can also be really hard, especially if you prefer solitude. Combining all of that... recipe for disaster!

Were you paying for 2/3rds of the groceries and toilet paper or using stuff he bought? I let my brother use my house when I was out of town for a few months. When I got back, I saw that he had 'shared' a lot of my stuff, like a year's supply of razor blades and expensive women's bath products. He burned through a tank of oil ($1k) before it got cold, managed to run up larger water and light bills than I had with two people living there. I was pretty mad-- I had quit my job to travel and didn't include his exorbitant expenses in my budget.

I told him I was unhappy with what he did and then I decided to get over it. It's not worth having a bad relationship over something like this. I knew what he was like before I let him stay in my house. You knew that your brother would be hard to live with, and it turned out he was even worse as a roommate than you expected.

I would try to focus on being glad that I had an alternative place to go and glad that I got out of an unhappy living situation with my brother before it got even worse. It was so bad that he actually moved out while you were there, right? And you couldn't have been happy living with someone who just kept complaining about every little thing you did.

You both learned you can't live together. If you can, I would leave it at that. Unless there is a bigger history, I would let this one go as the kind of disagreement siblings sometimes have--- and just tuck it away in the back of my mind for future reference (in case he wants you to get involved in the family business some day, for instance). I hope you guys can get a place of your own soon and have a little peace from the family drama!