What is "then" here?
I can hardly understand the "then" here.
"Then" means at a particular time in the past or in the future.
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I wasn't treated fairly, but then (again) it's life.
If you think about it more or from a different perspective, it will make more sense. If you believe that the world we live in doesn't always seem to be fair, then you, who were treated badly, is a just another example of this belief.