I guess you would like to know what I'm doing here... so let me tell you. I know from a friend of mine that it's your birthday and I thought...
Is it natural to say "so let me tell you" period without adding something right after it as in my example above?
Yes. It's not unusual English. Interpret it this way.
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Yes. It's not unusual English.
Interpret it this way.
I guess you would like to know what I'm doing here... so let me tell you what I'm doing here.
Clive