I hesitate to confess this, but on a daily basis I use the Ling Ch'i Ching- a more complex companion to the I Ching oracle- to indicate what each dawn holds for me and how I should proceed through yet another incomparable day on this most resplendent of planets.....;
as to more mundane matters like dealing with our fellow humans in relation to which you ask:
"what would be my response if I 'trusted somebody to be true to me and they weren't'";
Well I have to say in all sincerity that I am long past expecting anybody to be true to me; this is not because I lack trust in people but because I would regard it as an imposition on my part to have that expectation of another person. For the most part, I deal only with people with whom I have established a mutual respect[ sometimes one is of course obliged to rapport with the unknown- a plumber, an automobile mechanic in an emergency situation with whom one can only pray for mercy ].
If a close acquaintence disappointed me I would be saddened but I hope I would find it within me to forgive- I disappoint myself so frequently in the course of each day that I have developed largesse in forgiveness.
What has all this got to do with TRUTH.., I can hear someone muttering in the background.., well not a lot except for the fact that I have attempted to be honest in my response, and honesty is sort of the first step towards TRUTH.
with respect ,