Lies vs Trust

Have you ever lied? To your parents? To your other half? To your friends?
How would you judge whether a lie harms? Kills? Hurts?
What kind of lie would be consider a white lie?
Why actual explanation more than often could not cover the fake intention of lying?
Is lying really unforgiveable?

If just to lie to a person, there's so many things to consider, then one would really have to lie. At times, there's just a thin line between lie and trust. Lying to a person doesn't mean you are causing the person whom you are lying to to not trust you as much as before.

Sometimes, the lie isn't that serious, but it's because the explanation isn't that convincing enough to allow that lie to be pardonable, until it backfired and everything just worsen.

Right now, i don't know whether to proceed or move back. I'm left hanging in the air. Nothing is done. Nothing is said. I couldn't do anything now....Sadly....Trust does not need to involve belief in the good character, vices, or morals of the other party.

When will i be able to gain back the trust so i was told that it's lost yet i just couldn't believe and accept it?