Always do what was said

Lies. No matter how small or big or insignificant you think it is, have its own consequences.

When you say something just for the fun of it, then be prepared to face the consequences.
Never say one thing and do another.

That's where the sense of distrust and doubt sprouts.

I honestly don't go and do things just to be lied to.
Nor I want to be lied to.
That's just horrible.

Lies might sometimes seem to be for the better for a particular situation now, but it's never a good idea in the long term. That's where the sense of betrayal comes.
Once the lie is exposed - which it will, there's no turning back.

Just be honest.
In the things you say.
In the things you do.
In relationships.
In life.
Be honest.