To write such a story, start by establishing a strong foundation of trust between characters. Introduce conflicts and challenges that test that trust. When the betrayal occurs, show the emotional fallout and its consequences. Also, make sure the reasons for the betrayal are believable and not too contrived.
It's hard to say for sure. Sometimes authors draw inspiration from real life but add fictional elements to create a more compelling narrative. So, it could be a mix of both truth and fiction in 'Trust'.
In most cases, no. 'Betrayal' is often a fictional construct that allows for creative exploration of complex emotions and situations. It's not necessarily rooted in an actual real-life event.
One example could be in the novel 'The Kite Runner'. Amir betrays his friend Hassan who is like family to him. He doesn't stand up for Hassan when he is being bullied and later on, he lies about Hassan stealing. This is a form of family - like betrayal as they grew up together and were as close as brothers. It shows how jealousy and fear can lead to such a sad act of betrayal.