Is my friend a liar?

I once had a friend. She always told lies, and I was so stupid to believe her. Finally I was used by her. She just considered her own interests. I doubt she never treated me as her friend, although she were apparently good to me and showed her naivety. Later I found she just used me. I was hurt badly. I think you'd better tell her what are you thinking and see her response. You have to judge by yourself if it is worth to befriend her.

There is always a reason behind all it . Unless your friend is insane, maybe any something she hide, an embarrassing if other people know. There are times when we have to lie, even though the truth is above everything else. But, if kept, would be habit. Occasionally you have to force her to say really. If not, she might feel comfortable continue to lie. That could hurt everyone, even herself.