Lies

1. I don't masturbate - stupid and unbelievable but a harmless enough thing to lie about
2. I never pee in the shower - also unbelievable but still harmless enough
3. I'll be 29 on August first -- Untrue but more of a joke than a lie

Those are harmless enough lies

These are not

1. I love you - very hurtful, NEVER say this to anyone unless you mean it
2. Yes - also very hurtful. If someone asks you to do something that you know you aren't gonna do, say no for fucksake.
3. BRB - - famous last words

see the difference?
make notes if you have to

And please keep in mind that a mean truth is always better than a nice lie