I’m feeling a little insulted but I’m not sure if it’s a reasonable way to feel under the circumstances. A couple of days ago I invited a buddy to get together this evening, and we made a plan. It was definite and I was looking forward to it. He sent me a message a little while ago saying he had made plans with some other guys (who I don’t know) to do something different, and invited me to join them. So I’m feeling ambivalent because he didn’t talk to me before he changed his plans, but he did ask me to join them. It still feels kind of rude to me. If it was me who wanted to change plans I’d already made with a friend, I would have called them to discuss it before I made plans with other people, even if I wanted to include him too.