I'm annoyed by my friend bringing over my crush's crush at lunch
What do you think that she felt when this happened?
I think she is fed up and annoyed at me and my friend.
If your friend is friends with your crush's crush then you shouldn't dictate to them who they can or can't hang out with. Instead, you should tell them it makes you feel uncomfortable and hope that they care enough about you to understand.
It's just not fair.
I get that, but I think that as adults we should not try to tell people who they can be around. Just try to avoid the situation if it makes you that uncomforable.