But how will it happen? In a recent interview with Wetpaint Entertainment, Keegan Allen teased some details that make us more anxious than ever to see it all go down.
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"The collective 'A' messes with Spencer so bad and pushes her so far," Keegan teased. He added that Spencer finding out the truth about Toby is "a betrayal on top of a betrayal, and it twists the knife. It's so sad the way that she finds out." He also called the revelation "so wrong" and "terrible and mean."
Of course, the very fact that Toby's on the "A" team is totally twisted. But Keegan's words make us think the actual reveal happens in a super dramatic, terrible way, too. But what could it be?
We've come up with a few theories, and then we want to hear yours!
She catches him doing something to her or one of the other Liars. It would hurt to find out your boyfriend has been helping to torture you and your friends, but to actually catch him in the act? That would be ten times worse.
He tells her — in a cruel way. We're holding out hope that Toby isn't totally bad, and perhaps does indeed love Spencer. But if he is really evil and doesn't love her, the cruelest thing to do might be to tell her the truth while making it clear that the entire relationship was a lie. (We hope not!)
She finds out during a romantic evening. What if Spencer finds out the truth on what's supposed to be a super special, romantic night for Spoby? That would certainly suck.