I think that yes, alters can lie, but at least with our experience, our alters have never lied about something like that. They've lied about minor things, but when it comes to traumatic experiences, although it is of necessity subjective, it's the truth as they see it. So we believe them.
And we also think your therapist is way out of line to tell you it's part of your "fantasy world," wtf? People deny traumatic experiences because they don't want to believe they happened, it doesn't make them "fantasy."
