I think the last time I really cried when I was sad was when Hal died, which will be three years ago this summer. Probably not a coincidence. I'm sure it's related, and I don't know what the deal is exactly. I'm sure I could talk to my shrink about it, and the tears would probably start again, but I'm just going to let it go for now, it's not affecting me negatively and I think it's just a phase. It's just where I am in my life. I suspect that at some point in the future that will change. We'll see.
For now, I remain a robot, tearless.