Sad. If it was as the story seems to indicate, he may have had the gun for protection (they were out in the middle of basically nowhere). If she fell and got severely injured.....if he didn't want to leave her alone to try to get help because she was hurt bad....maybe hoped that someone would hear his cries for help....then running out of food/water....and then not wanting to leave her dying all alone and he wanted to spend their last minutes of life together and not with her by herself all alone.....if he "mercifully" killed her because she was in so much pain.....hurt....no food....no water....then killed himself because he couldn't do anything to save her.......and ultimately....himself......so sad.