person A: My friends from high school decided to gather and have dinner together. I was the only one left out. So disappointed in them
person B: That's kind of rude for them not to invite you. You should tell them you were hurt.
person A: I think i will just let it go and not to talk to them ever again. Such times provide good lesson to learn who is true friend and who is not
person B: You are right. Now you know who your real friends are.