I'm upset at a teammate for hurting the team
How could he do that? Do you know why he did that?
He is playing for himself and he don't see that he hurts the team
I understand, but it's not fair to cast the blame on someone who is doing their best. You should be more reasonable.
He just needs to change and play for the team. Instead of playing for the win, he wants to be a solo star.
Then I think it's best for the team to have a big discussion on what strategies to go through. This is a team sport, and each and every one of you matters, so no single person is to blame! Don't you feel like they are like family, even with all the quarrels?