Perhaps he means that there's a difference between 'coming clean' and 'being clean' ...
... covering up your sexuality, to advance your earnings, could be seen as dirty and deceitful.
I've no idea about his 'career' as I don't watch the kind of things he'd appear in, but perhaps he's cultivated some kind of faux chemistry with female colleagues that the public bought into. Perhaps he's presented a false identity and his marriage as being something it isn't. If that's the case then he could be thought of as being dishonest for personal gain. He might also be frowned upon, by fellow gays, as hiding his true identify until he had no other option.
If so it's no surprise he's having people turn their backs ...
... carefully