The relationship is official on "Castle," and that has lead to some complicated emotions. Especially because Beckett and Castle have agreed to try and keep their relationship secret -- although it seems unlikely to remain that way for very long. Even the case of the week had them questioning the secrecy and how it could impact the relationship.

The real test came when Castle was on a television show being interviewed about his latest book. The reporter asked him out on a date on-air, so he agreed to it. Beckett didn't like that one bit, but it was nothing to what she walked in on later after an unfortunate butt dial from Castle's phone.

What sounded like a struggle was actually -- well, it actually was a struggle, just not the violent kind. Castle was trying to thwart the advances of the reporter, and failing miserably. Beckett came in to see her on top of him in a skimpy bikini.

By the end of the hour, they'd agreed to not see one another. Their mutual jealousy at the thought of the other out with someone else simply won't allow it.

How long can they keep this up? Find out as "Castle" continues on Mondays at 10 p.m. ET on ABC.

TV Replay scours the vast television landscape to find the most interesting, amusing, and, on a good day, amazing moments, and delivers them right to your browser.

Related on HuffPost:

Loading Slideshow...
  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle Season 5

    Stana Katic as NYPD Detective Kate Beckett.

  • Castle Season 5

    Seamus Dever as NYPD Detective Kevin Ryan.

  • Castle Season 5

    Penny Johnson Jerald as NYPD Captain Victoria Gates.

  • Castle Season 5

    Jon Huertas as NYPD Detective Javier Esposito.

  • Castle Season 5

    Molly Quinn as Alexis Castle.

  • Castle Season 5

    Nathan Fillion as Richard Castle.

  • Castle Season 5

    Susan Sullivan as Martha Rodgers.

  • Castle Season 5

    Tamala Jones as Medical Examiner Lanie Parish.

  • Castle Season 5

    "Castle" stars Jon Huertas as NYPD Detective Javier Esposito, Tamala Jones as Medical Examiner Lanie Parish, Seamus Dever as NYPD Detective Kevin Ryan, Molly Quinn as Alexis Castle, Susan Sullivan as Martha Rodgers, Nathan Fillion as Richard Castle, Stana Katic as NYPD Detective Kate Beckett and Penny Johnson Jerald as NYPD Captain Victoria Gates.