I think that actors who win Oscars or any other awards really dig deep the get the performance right. What this usually does is open up the actor to a new awareness and freedom never experienced before. I believe that sometimes this can become overwhelming to a spouse. When compounded with the success that winning an Oscar can bring, this can be a lethal combination for relationships if it creates fear on the part of the spouse. Having said this, I will also say that men seem to have more of this fear. Hence the usually inevitable breakup.