how do you know if you feel guilt? (for others not one's self)

Hi Nunya. I like your chosen name. Nunya is kind of an injoke among my friends and I.

What do you mean by "for others"?

I may be mistaken but I assume that Nunya is referring to guilt felt for something done to another person such as cheating on a girlfriend or stealing from your neighbor.

If this is the case then I would be very interested in the answer.