I go the opposite route- it makes me sad and wistful. But that's my natural bent.
Still trying to get the therapist involved; they've finally connected with each other but no session is scheduled yet (holidays are such a mixed blessing sometimes). She talked about possessiveness and fear of loss. I talked about reading poly resources. Turns out she's already hit Xeromag and several other sites, and is currently a member of/lurking a mono-in-a-mixed-couple support group on Yahoo!.
I have to hand it to her- she's really on her game and continues to ask some sharp questions.