A person whom either because of severe medical issues that aren't physically obvious (eg: Traumatic Brain Injury) or has social phobias (eg: Social Anxiety Disorder or Agoraphobia) takes a longtime to get around to dating people that ask them out (ie: weeks or months). This is a real occurrence that happens in the medical field. It is not a personal issue against anyone dating them. These people simply require patience to the extreme.
Friend1: I'm really excited about the date Alex and I planned but I haven't heard back in months. Did something happen or is it my fault?
Friend2: Don't feel bad. I've known Alex for many years. Bailbaits require uber patience! No worries Alex told me you are the best. ~_^