How to rebuild a relationship after a breach of trust? What are the Buddhist norms &amp; guidelines for rebuilding a relationship after a breach of trust?
I can't think of any instances where the Buddha specifically addresses your question. However, you may find the Patience chapter in Santideva's Bodhicaravatara (Way of the Bodhisattva) quite helpful.
Of course, the whole chapter is profoundly useful (as is the entire text), but you may want to have a look, starting at verse 38 of chapter six. Here's a link: https://www.tibethouse.jp/about/buddhism/text/pdfs/Bodhisattvas_way_English.pdf