To me, I think this means that the relationship they are in is coming to its inevitable end. They have been going around in circles and still cannot find a way to resolve what is keeping them apart. He wants to tell her that it is over, but doesn't know how. He longs for the days when they had something beautiful, because that beauty, like a rose's, has faded, leaving only something that is crumbling away before his eyes.
To me, I think this means that the relationship they are in is coming to its inevitable end. They have been going around in circles and still cannot find a way to resolve what is keeping them apart. He wants to tell her that it is over, but doesn't know how. He longs for the days when they had something beautiful, because that beauty, like a rose's, has faded, leaving only something that is crumbling away before his eyes.