How do you go about trusting someone if backstabbers exist in some form?

Here's the kicker, think very carefully about this:

(A) if your parents raised you with love and care, always made an effort to see you through your education until college so a full 12 years (preschool counts) and celebrates your 18th birthday but then stops everything and makes your life a living nightmare but you have only 1 relative who you can trust but eventually back stabs you also what do you do here?

(B) say you have a childhood friend growing up but that friend eventually leaves you and betrays you somewhere along the lines of say high school and tells all your secrets on a P.A. System to humiliate you for no reason. What do your do?

(C) A friend online whom you've known for say 4 years. it could be an online game that linked you together with that stranger turned friend and you finally trust that stranger with almost everything about you (restrictions of course are your Social security number, your address, email, and your email, real name etc.)

(D) Say you married the love of your life, made you feel fulfilled but ends up betraying you and your trust by cheating on you, divorcing you, taking away your assets or half to be more close to the point they rat you out to the police and therefore has you put in solitary confinement at an asylum by claiming you are "unstable" what do you do if you have to serve a few years and once you get out where do you go from there? (just bear with me here as this is another scenario)

The 4 choices are all at the very end very similar as to how to approach the situation but some things vary from person to person based off of reactions, how they dealt with these obstacles before and the like.

make sure you keep your answers clear as this is a bit of a side project of a paper im writing psychological problems on, so if you may will you answer any of the 4 please?