She saw a counselor a few times a few years ago. We saw a MC about 5/6 times until he suggested that SHE needed to work on some things, even mentioned that he would like to put her on medicaton. We stopped going after that. She said she was done with him. Then after a complete meltdown before a math test she saw an individual counselor for about 5 sessions but then quit going. At the time said it was because she didn't have time during school and she would go back. That was last September. I suspect it was the same thing, the C told her something about working on herself and she quit. A pattern ya' think?
As for your dilemma, I wouldn't get upset if he didn't know. Your getting upset because of your own disappointment not because of something he did intentionally to you. How about this? Mention to him that you had gotten the tickets and why, then say that maybe he would like to go with his brother. Offer him the tickets. If he takes them you are one up in the good deed department, if he doesn't find a friend to go with and have a good time.
Stand up for what is right, even if you are standing alone.