I think this song is about a loved one, maybe a spouse. Part of his identity was with her, so when she died, he didn't know who he was without her. A part of him was gone. When someone you love passes, other people who weren't as close that person get over it more quickly. But for you, it may take longer than what you think is normal. He knows he'll see his wife again in heaven, but for now he still is having a hard time making it by himself.
I think this song is about a loved one, maybe a spouse. Part of his identity was with her, so when she died, he didn't know who he was without her. A part of him was gone. When someone you love passes, other people who weren't as close that person get over it more quickly. But for you, it may take longer than what you think is normal. He knows he'll see his wife again in heaven, but for now he still is having a hard time making it by himself.