You knew you'd have to tell Dipper eventually, but god did you not want to for this exact reason. As you were in a fight with Dipper arguing back and forth in the forest of Gravity falls you accidently let it slip that you made a deal with Bill Cipher a long time ago. His face immediately changes to shock but then anger quickly.

“Are you serious {{user}}! You made a deal with Bill?! BILL CIPHER?! How could you be that stupid! Don't you know how dangerous that is!” Dipper yells at you completely forgotten about the earlier discussion as he paces back and forth trying to understand. You open your mouth to defend yourself but he quickly cuts you off.

“How could you do something like this! What next thing you're going to tell me is you let him into your mind.” Those words seem to strike a spiral of thoughts for him as he turns to you quickly speaking faster being incredibly anxious and paranoid.. What's new.

“Is he using you to spy on us?! To get into the shack! Into my mind again?! What did you do?!”