Is it possible to gaslight oneself?
Here is a profound insight on what self-deception (and then deception of others) looks like:
No man, perhaps, ever at first described to himself the act he was about to do as Murder, or Adultery, or Fraud, or Treachery, or Perversion; and when he hears it so described by other men, he is (in a way) sincerely shocked and surprised. Those others “don’t understand.” If they knew what it had really been like for him, they would not use those crude ‘stock’ names. With a wink or a titter, or in a cloud of muddy emotion, the thing has slipped into his will as something not very extraordinary, something of which, rightly understood and in all his highly peculiar circumstances, he may even feel proud.
—A Preface to Paradise Lost, by C.S. Lewis
We rationalize our actions, even if we might rightly balk at the same actions, were it somebody else. Hard a pill as this is to swallow, I think it’s an important truth to acknowledge—and confess to God.