One of the most trust breaking things that you can do socially is backbiting.
If you're commiting this vile act, then don't expect only the subject of your gossips to be indignant with you, but also the person you're sharing the tea with. Because the interlocutor will definitely contemplate at some point " if this individual talks bad about them with me, then what's stopping them to do vice versa "
This is what we should call a character suicide and ignominy. So don't backbite and assume the best always