What do you normally say to someone you don't see a future with? How to break it to them gently?

Don't want to waste both of your times. I am not in this situation anymore. But want to see what others do.

What do you normally say to someone you don't see a future with? How to break it to them gently?
What do you normally say to someone you don't see a future with? How to break it to them gently?
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