Remember that when you place your trust in someone, it is a contract between your evaluations and expectations, not them, as they will do as they do.

That's an interesting viewpoint. I think trust is indeed closely related to the expectations you have of someone. It takes time to build trust, since you really have to know the tendencies of the other and have to build a close relationship with each other before you can start to expect certain things from them. Trust in that sense is being sure that the important expectations will be met. Can I fault them for the moments that they break my trust? Perhaps... Perhaps I'd have to change my views on the amount of trust I can invest in our relationship, and perhaps that would redefine the relationship as a whole... If my best friend didn't for example show up on the funeral of a family-member, that would have an impact on my trust of him being there for me in times of need. I would see myself blaming him for that too... But then again, trust isn't a word with a stable, constant definition. It changes over time, and that's just how it is.

Pretty hard topic to think about in my opinion :)