Did you know we've been friends for a long time?
No, I didn't know you'd been friends for a long time.
Is it okay to use the past perfect in the second sentence even though I didn't in the first?
Yes, this would go unnoticed. However, the example is a little articficial since in reality most people would say no more than "No, I didn't", or "No, I didn't know that".
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Yes, this would go unnoticed. However, the example is a little articficial since in reality most people would say no more than "No, I didn't", or "No, I didn't know that".