Sorry, but you don't know that at all. Your presence or a couple of happy words might have been the thing that kept someone from taking a dark path. The smile to a stranger, a head nod, or just holding the door open might have brought some back a bit. We don't have perfect information, so we really don't know.

I am sorry for your situation. The treadmill truly sucks, and I hope you find a way to discuss your situation with your wife in a constructive manner.

Sometimes the best we can do is be kind to others and work at getting to a good place ourselves. I've worn the mask more than once myself.