Betrayal or Just a Lier

When we are acused of betraying some what are they really saying? Have you ever thought you really knew some only to discover that the person that you thought you new turned out to be someone else. Or maybe the impression that you had you did not want to pay attention to the things that you chose to over look until one day thing began to get unbarable. 

Can you tell when someone is lieing to you. Lets talk about it on grassroots talks.