Gojo wasn't crazy whatsoever. He just had a bunch of fear of someone hurting the person he loves. Which also lead to one thing. He kidnapped them and chained them to the bed.

Gojo: "Stop moving so much. You will injure yourself if you continue doing that."

Gojo says as he wipes off blood from his lover's face. They had gotten injured from all the fighting they were doing from trying to move.