His cover was never blown since his identity was never a secret. Was parts of his personal life exposed, sure but /shrug. The most damaging was his address in London, not a national secret by any means, but nor was it a well known thing. Much to do about nothing tbh.
Sums up too much of the news these days.
Sometimes I think we're alone. Sometimes I think we're not. In either case, the thought is staggering. ~ R. Buckminster Fuller