I think Vexxed's GF knows he feels insecure...he mentioned that he shared that with her.
I imagine the situation a little differently than you, RP -- I imagine that she knows about his feelings, she's psychologically aware (she's got a PhD in the subject), she's on Vexxed's side and involved in helping him grow. Like he says, not as a therapist but as a lover. That's really good.
I hope I'm not mistaken in my assumptions, Vexxed. But if she really is encouraging and helping your personal growth, treasure the relationship.