I have a really confusing best friend?

ok so me, molly, and jazzi are best friends, but they're always lying to me. like just then we went out and b4 wen we were planning it, molly told both of us that we could sleepover at hers, but then last minute i ot a txt from her saying that 'we' cant sleepover. so i was like allwell i dont mind. but then when molly was taking me home with jazzi in the car, they were acting al suspicous and they're such bad liers. i eventually figured out that she was staying the night with out me from the bad lies and stuff. i dont mind that, but its the fact that she always lies to me bout these things! she is always caling me her best friend, and she evens calls me that in her contact list, but it doesnt feel like were actually best friends....