I can’t believe you just did that. I would have expected better from you.
or,
I can’t believe you just did that. I would expect better from you.
Are both possible and correct?
Use the first one. The event (what you did) and your expectation occurred in the past. You can also say: I can’t believe you just did that.
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Use the first one. The event (what you did) and your expectation occurred in the past.
You can also say:
I can’t believe you just did that. I would expect better from you.
The event (what you did) occurred in the past and and your expectation is in the present.