is why he does not act on his feelings, because though Gwen would let him flirt with other people, he could "never afford to do anything more". Gareth David-Lloyd, who played Ianto, feels that for Jack, "there’s two different sorts of love going on there", and that Jack feels for Gwen and Ianto in different ways, although both have helped him become less emotionally isolated. Lynnette Porter feels that part of the reason Jack leaves Earth at the conclusion of Children of Earth is Gwen's idealisation of Jack, which is so intense that he cannot stand to look at her in the wake of Ianto's death. Gwen hopes that she is reason enough for Jack to stay on Earth, but Jack is ready to give up any hero worship because he feels unworthy. A press release for Torchwood Series Four states that Jack is brought back to Earth because of his "unstated love" for Gwen, who in turn still feels for Jack and misses the exciting life she once led beside him. Whilst Miracle Day lead writer Russell T Davies states in response to a question posed by AfterElton that he "hates" the idea of romantic tension between Gwen and Jack, executive producer Julie Gardner answers by stating "They love each other. Of course they do." Myles believes that in series four, Gwen and Jack have a "love-hate-love relationship" resembling in different ways a sibling relationship, a marital relationship and also "the strongest friendship". Episode seven of Miracle Day features a scene where Jack threatens Gwen with violence after she states she would have him killed to save her daughter. Writer Jane Espenson explains that the two characters have different needs and that this means they inevitably "clash like steel blades". Simon Brew of Den of Geek praises the dynamic between Gwen and Jack in series four, describing them as "a terrific double act" and states that "Torchwood is at, or near, its best when the two of them are working in tandem". Other Discussing whether his character could ever find "The One", John Barrowman asserts that Jack "likes everybody, and his love for each person is different". Barrowman believes that Jack does harbour romantic feelings toward the Doctor, but "would never take that beyond infatuation" and "would never let the Doctor know". Barrowman claims that Jack also "fancies" fellow companion Martha Jones, admiring her "tenacity" and willingness to "spat