As others have said we don't know what goes on behind closed doors and how much his wife or kids knew. It's possible his wife has known for a long time and they've lived their lives happily in their own way. I know of a couple in a similar position who are staying together until their children are adults. Their focus is on their children so they don't want to have other relationships, and only a few people know their true circumstances and everyone else assumes they are just like the rest of us, whatever that may be!
Personally I don't see why he's brave or a hero because the only difference between him and the millions of other gay people is that he's a celebrity, but that's his career choics so why should that mean he's braver than a doctor or mechanic whose gay?