"What is this pig doing?"
He's being based as fuck is what he's doing. Mark my words, later there'll be a reveal that he's been doing the equivalent of being "the crazy hobo" in an eldritch horror story who knew what was going on the whole time and wanted to protect the MC.
What if... Just what if... The reason she changed, is because she grew up from those childish days, and started realizing you are a rude prick of a friend?