didn't seem so important -- not then. not like it would later. just as they walked into the apartment, the doorbell rang. it was dave's ex-girlfriend liz, here to pick up some things she'd left behind in his apartment. awkward, but cari just laughed. bowed out. >> she said, "ah, i -- i get it. it's not a big deal. i -- i'm gonna go home. you call me when you're done dealin' with this mess." >> reporter: so dave escorted cari to the door. >> and her and liz passed each other at that moment. there were no words spoken. >> reporter: did it start then, at that moment? later, once liz left his apartment, dave called cari. >> and she invited me out to her place. which was, like, an hour drive outside of town. cari, when i got to her place -- we're there 20 minutes makin' coffee, b.s.-in'. and of course pretty soon we're on the couch. and -- and we're gettin' a little closer. now, at this point, we haven't