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It goes to Shubham and nobody else. He reads it himself, and he is the only one who does.
What is and is not private here is written out in full on how this site handles your data. Short version: what you write is encrypted before it is stored, and Shubham can still read it — the key is on the server, not in your hands. That protects your message from a stolen database, and not from him. It is not end-to-end encrypted, and it used to be.