I've always thought Casey was a married man who was having an affair and he is going on one last visit to the other woman to end it. He still loves her and is feeling very sad, but the affair must end because he now has a young family.
The choruses tell us how the other woman is feeling. She is deeply in love with Casey and lives for the times they can be together which have been getting less often. She gradually comes to realise that he has come to end the affair.
I've always thought Casey was a married man who was having an affair and he is going on one last visit to the other woman to end it. He still loves her and is feeling very sad, but the affair must end because he now has a young family. The choruses tell us how the other woman is feeling. She is deeply in love with Casey and lives for the times they can be together which have been getting less often. She gradually comes to realise that he has come to end the affair.