Thinking about how Zane had literally nothing, nothing at all. No memories, no family, no place. The ninja never really accepted him all too much at first, he wasn't sure who he was.
And then the Falcon appears, it helps him, and it becomes his first sense of identity. He finally feels like he has something. Like, woah, at least I am here. I'm a living being and this bird has a connection with me.
Only to find out he was a robot, and that bird was only programmed to connect with him. That he was never a human and would likely never be seen or treated the same. That he could never see himself the same. That he was simply built, abandoned, and forgotten. That he had no mother and no true father.
Just imagine how that would tear someone apart. Goddamn.