Once a cheater always a cheater. Agree or disagree?

Are there certain actions/choices in life that you can't come back from; Like once you cross that line, you have to stay on that side. We have this mindset in other situations, perfect example is murder. Once you murder somebody, you ARE a murderer, and no amount of time after that changes it. Can people change or are they bound to the lines they've crossed in the past.
Once a cheater always a cheater. Agree or disagree?
Yes
No
I've cheated in the past, but it was a one-time mistake...
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Once a cheater always a cheater. Agree or disagree?
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