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Reply to "How could you do that!"

A: I will ruin his life.

B: How could you do that! He has done so much for you, after all.

Can I use "could" in this sentence, where the action of ruining his life hasn't yet taken place? Is "can" possible?

I know the following are possible:

How could you say that!
How can you say that!

Hi, Language learner—In the context you have given, what would be the most natural is this: "How can you think of doing that!"

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