My best friend suggested us to go to a summer course together, so I agreed with them and bought the $1,000 course. She FORGOT to tell me she didn’t sign up. Guess when she told me? 2 days before the damn course. I can’t even get a refund now. I confronted her about this and she sent a handful of memes and an egotistical apology, like she was teasing my naivety. I’m pissed so I blocked her. I now feel disappointed in myself for doorslamming at her yet absolutely betrayed. I don’t know what to do now since she basically is my only close friend.