It might be helpful to step back a bit-- for what task are you using Fiddler?
By default, Fiddler registers itself as the system's proxy server on startup, and traffic from web browsers (IE, Chrome, Firefox, etc) flows through Fiddler for inspection. If
you enable HTTPS decryption, Fiddler will perform its man-in-the-middle technique and will show the plaintext traffic; if you do not, Fiddler cannot "read" the traffic and simply blindly forwards it back and forth through the tunnel as described.
If you don't want Fiddler to capture traffic from anything on your system (because, say, you're only using the Composer feature) then you can easily untick File > Capture Traffic and/or click Tools > Fiddler Options > Connections and untick the "Act as system proxy on startup" checkbox.
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