DiNozzo fails to follow through on a promise to Jeanne
The honeymoon stage of the relationship came to a screeching halt when DiNozzo couldn't muster up the courage to tell Jeanne he loved her. Before racing each other in a wall climbing competition, the couple promised each other that the first person to reach the top would profess their love for the other. But, when it came time for DiNozzo to say those three magic words to Jeanne, he clammed up.
Hurt, Jeanne went home and refused to answer Tony's calls for days. Eventually, she contacted DiNozzo and told him how she truly felt, challenging him to determine if he felt the same way.