Gay marriage became legal in Washington state last month.
Nabors is 82 years old. Cadwallader is in his late 60s. Nabors said you've got to solidify something when you've been together as long as they have.
They couple met in 1975 when Cadwallader was a Honolulu firefighter.
Nabors said he's been open about his homosexuality to co-workers and friends but never acknowledged it to the media before.
Nabors played Gomer Pyle in "The Andy Griffith Show" and "Gomer Pyle, U.S.M.C." television shows.
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