Regan thinks what happened with Louis is all her fault, because she didn't realize what kind of monster he was before. Tyler reminds her that she didn't even know that Louis was a werewolf and that it's not her fault. The two eventually realize how they've been both blaming themselves for what happened and agree that it's time to stop and start figuring out a plan instead.
Regan thinks what happened with Louis is all her fault, because she didn't realize what kind of monster he was before. Tyler reminds her that she didn't even know that Louis was a werewolf and that it's not her fault. The two eventually realize how they've been both blaming themselves for what happened and agree that it's time to stop and start figuring out a plan instead.

Transcript

Regan: He was just using me, and I didn’t even realize it.
What happened is all my fault.
Tyler: No, it’s not.
You didn’t know what he was.
Neither did you. And yet that didn’t stop you from blaming yourself for all these years.
Tyler: I don’t—
Regan: Don’t even try. I know you do.
Tyler: …
Tyler: …Alright. How about we stop blaming ourselves for a bit and start figuring out a plan instead?
Regan: -Sniffle- …Deal.