How do you feel about lying?

Today I missed an art class cause I slept in and forgot to set up my wake up system and I told the facilitators I could not make it due to a phone consultation with my doctor.

But it was really a 1-10 minute attempt to discuss changes, get updates and make changes to future appointments, not an actual consultation and I did not know they would call me today so that was not the reason I did not go to art class.

I feel unsatisfied cause I lied, even though I got away with it.
How do you feel about lying?
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