Occasionally we find love and eventhough one or both give their best for the other, because of circumstances it may not be enough for the other. When doubt and uncertainty creep in, it may leave a partner feeling, is it worth it? (Just like how a hunter may wonder if it is worth shooting and killing a deer if he only wants the deer as a trophy). I feel what the song writer is saying is please remember, during those moments of weakness, why you got together in the first place, and to remember the "days" that make it worth it (cause sometimes people forget). Beautiful song.
