X: I hope you can forgive me.
Y: _________________________? You're my best friend.
- How could I not forgive you?
- Why would I not forgive you?
- Why should I not forgive you?
What is the best way to phrase this to basically say "Of course I forgive you. Why would you ever doubt that"? (please let me know if you have a better option than one of the three I suggested)
I prefer #1. #2 is OK. I like #3 the least, in this context.
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This is informal conversation, so I'd recommend contractions.
I'd probably say Why wouldn't I forgive you?
CJ