I haven't cried in over a decade. Why is that?

I've teared up from laughing, cutting onions, dust in the eye, etc. But haven't cried.
I've felt sad enough to feel the urge to cry, but as soon as I think I'm about to let out a sob I stop.

The wide pointed out she hasn't seen me cry since we've been together. There last time I remember crying for real was when my dog died. She was just a puppy. Even thinking about gets me choked up but still no crying.

Anyone know why that is?