Sometimes you may love anybody (girlfriend, friend), and this person may have a lot of problems, or just a big one (like an addiction). But in some point you realize that you can't keep on with the situation. You can't help anymore (you may be tired, without money, or the problem eventually could kill you). Then you take a step aside, and say, hey, you're great, I love you, but I can't give anymore... So, I'm out, but "may the good lord, shine a light on you". May the lord take good care of you, may the good lord help you, may the good lord save you.
To me it's very simple.
Sometimes you may love anybody (girlfriend, friend), and this person may have a lot of problems, or just a big one (like an addiction). But in some point you realize that you can't keep on with the situation. You can't help anymore (you may be tired, without money, or the problem eventually could kill you). Then you take a step aside, and say, hey, you're great, I love you, but I can't give anymore... So, I'm out, but "may the good lord, shine a light on you". May the lord take good care of you, may the good lord help you, may the good lord save you.