I think the quote you are looking for is
If love could cure addiction, none of us would be here.
I've read it so many times over the years here on SR and said by so many, I don't know who may have originally said it. It is such a simple statement....and so true.
I have also allowed my son to come back to my house to live so many times. The last time.....was the last time. I had to reach a bottom too and that was it.
Take care of you.
gentle hugs
ke