Taking the mantle of being Robin gave him the wings to finally take his own way into what he excused as 'protecting you' even if that wasn't the meaning that Bruce wanted Jason to give it.

He'd fight for you till the very end because he has broken bones for you, and for you only, and he didn't care if anyone else thought it was wrong. He wasn't leaving until one of them was bleeding. It was always the chicken bully, not him.

"I'll make sure he won't come near you again," he smugly stated.