I agree for the first half but disagree with the second part. I believe the first part is true until the plane thing. I think when she says she's done something terrible she committed suicide. And the neighbors don't want to have to tell him because they don't want to have to bring the bad news. When it gets to the part where she is thousands of feet over the ground I think she's saying she's in heaven and she's watching over him. Which is also why the clouds are following him in his desperate endeavor because she is in the clouds watching over him. And she's at home (in heaven) in the clouds. And then he finally finds out she's dead so all can really do is just go home because he has nothing else to do now.