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tl;dr version: give him the benefit of the doubt, unless you find he's acting in bad faith by demonizing other gay people. Wish him happiness in his new life and realize that every single person is a mystery at their core.
If you find that he's spouting "ex-gay" nonsense, I'd say you don't owe him any congratulations or any sort of communication at all.
But, you have to bear in mind that people are not as consistent/linear as our social and political constructs would have you believe.