Let's start with Spencer kissing not one but TWO of her sister's fiance's.
First there was Ian, and then there was Wren.
Or! Remember Hanna's Mom Sleeping With Wilden?
What about Aria secretly hunting down Ezra's "son" - that was a doozy.
This was definitely a bad call on Aria's part. Particularly since it turned out Malcolm wasn't actually Ezra's kid. Awks.
That Whole "Toby and Spencer Separately Join the A-Team" Thing...
There are PLENTY more.
Melissa faking her pregnancy, Byron asking Aria to cover for his affair, Paige telling the cops about Alison - the list goes on and on. Which betrayal was YOUR favorite and who do you think is next in line?
Let us know in the comments below!