Even though I love the above explanation, I have my own theory...
Over and over, he relives this horrible tragedy, something that happened to the one he loved. He realizes that he had it so well with this beautiful, lovely woman; he knew how much he loved her, but he never knew the life he was living inside was as good as a dream. When she died, and he began to go through the heart-wrenching process of burying her, carving out her name on the cross... he finally began to realize that his previous life was (metaphorically) a dream, and all dreams must come to an end, just as his life with her had. "In dreams there's a way to die" - in his dream-like life, there was a way to die; a way for it all to come crashing down, a way for his soul to die as she did. He weeps for her and replays her death and the way he towed her lifeless body from the wreckage, and although he tries to remember her perfectly, she is already fading from the "dimming shadows" in his head. She has left him forever. In dreams like his, there's a way to die. And she found that way. She's gone.
Even though I love the above explanation, I have my own theory... Over and over, he relives this horrible tragedy, something that happened to the one he loved. He realizes that he had it so well with this beautiful, lovely woman; he knew how much he loved her, but he never knew the life he was living inside was as good as a dream. When she died, and he began to go through the heart-wrenching process of burying her, carving out her name on the cross... he finally began to realize that his previous life was (metaphorically) a dream, and all dreams must come to an end, just as his life with her had. "In dreams there's a way to die" - in his dream-like life, there was a way to die; a way for it all to come crashing down, a way for his soul to die as she did. He weeps for her and replays her death and the way he towed her lifeless body from the wreckage, and although he tries to remember her perfectly, she is already fading from the "dimming shadows" in his head. She has left him forever. In dreams like his, there's a way to die. And she found that way. She's gone.