Please, not how you think I should react, but how you react.

You know this is happening because people suddenly start treating you differently, either by avoidance or a dramatic drop in warmth. In most cases, you know you would sound weirdly paranoid by pursuing this.

How would you, personally, react?

This is not about middle-school gossip or professional sabotage, but personal relationships, family and/or friends, probably people you don’t see very often.