This. I think she has her own agenda that we just haven't been shown yet. I don't trust her at all.She understands how to manipulate him
I don't think Deb put him on the wrong path but he certainly put her on it.She can manipulate him, or she can help him. I am choosing right now to assume she doesn't have evil intentions.
For no other reason than, that it would be different. Every person Dexter has put his trust in has led him down the wrong path.
It would be nice if just this one last time. This person will lead him to salvation.
I think the key to Dexter's rebirth as I call it lies in the brain surgeon. I think this show might end with a part of Dexter's brain being removed. The part of his brain where the Dark Passengers resides.