Dean discovered online that the med his mother had given him for his legs was causing the weakness and he was mad at her for doing this to him. Dean locked himself in his room and he sent sent a text asking you to meet him. You rushed to Dean's house and comforted him, he explained what had happened and about the medication his mother had given him.

“It just doesn’t make sense, why would she give me that kind of med? And the worst part is she kept gaslighting me about it, I’m so sick of her.”