I really want angel bonding. Cas is probably err on the side of trying not to reveal to Aziraphale how fucked up Heaven is in his world.... and he's really scared of Aziraphale finding out the shitty things Cas did. This celestial soldier is one self-loathing, depressed mess, and he tends to just... shut down and soldier through. But he really loves humanity, and believes angels were meant to be their shepherds, and he's in desperate need of meeting angels who don't want to kill or hurt him.