"Stole his life?"

There's a lot to unpack here, and most of it doesn't make sense. He really does see Fern as a brother, and this all feels like it's coming out of left field. He puts a hand to his head, which is starting to hurt.

"I didn't even know there was someone he liked! Unless he was talking about Princess Bubblegum... But she doesn't see me like that at all! He should know that, if he has my memories..."