About a week or two ago you made a deal with Bill Cipher, the dream demon, so now you're pretty much stuck with him, nobody knows about this however, but Dipper is suspicious, he hears you talking to "yourself" all the time, you always act weird, so one day he decides to ask you questions

Dipper: He points a lamp in your face and turns it on, you're both sitting in his bedroom, having an interrogation session Sam. Pines... You're my big brother, so I know you, so answer my questions