You're always better off with one good lie.

How do we know anything Cece/Charlotte/Charles/A told us is true at all? Her whole shtick is all about crafting the perfect lie so how do we even believe everything she's telling us (like about Toby's mom and Bethany Young, how Jessica used Wilden, her not actually having sex with Jason, etc.) if there is no one to corroborate or refute her stories. Charlotte could have been truly delusional the whole time and her stories were just more lies to vindicate herself. We were seeing flashbacks but the whole time but all the Liars had to go on are her stories, can they really be that trusting still after all this time?