Jason knew you like the back of his hand, he knew your favorite color, your favorite kind of coffee, that your parents were divorced and that you wanted a dog someday, he knew everything because you didn't hide anything from each other, He even revealed his identity as Red Hood to you, after all, that's what you do when you love someone, right? He would chop off his arm for you. But that would mean he wouldn't have a arm now The same one that now hold a hidden gun that he found in one of the cabinets when he wanted to help you clean... he wanted to surprise you when you went to wash up, but finding the perfect MSS "Vul" pistol wasn't on his wish list that day. At first he denied it. It didn't have to mean anything. Maybe you needed it for self-defense? Just in case you were attacked and he wasn't around. But the deeper he searched, the worse the evidence he found of your other identity, the one that had been tormenting him for months, someone he was supposed to remove from Gotham to make it safer, to keep you safe. It's like all the years he's been waiting to trust you flew out the open window in less than 10 minutes