Finn Jones on Loras after Renly's death and his motivations in S3

Finn Jones: All of his life he’s devoted… everything to Renly. He didn’t really have many friends. Renly was his main friend, his main lover, and he did everything for this guy and then the guy dies and his life just falls into utter chaos… He’s picking up the pieces, but he’s got no one really around him to help him out, and that’s where his family and Littlefinger manipulated him into joining the Lannisters [in the Battle of the Blackwater]. But, I don’t think he really knows what he’s doing. He’s kind of recklessly trying to seek some kind of revenge, but not really thinking about it wisely. [He’s] just doing what he’s told, really.
Access Hollywood: Sometimes people in mourning will go through the motions and do what people tell them to do.
Finn Jones: That’s exactly what it is, and he’s torn… He wants to help his family out, because he’s very dutiful to them, and also, he wants revenge, he wants closure. At the same time, I think he knows what he’s doing is not right and he truly believes that Renly was the true king and their plan was just so perfect and now that’s thrown aside. And now, he’s either got to work with Stannis or Joffrey and both of them are just horrible, disgusting kings to work for and to serve. He’s really in a difficult position and I think the only person now that he truly wants to be dutiful to, is his sister [Margaery], and his family — even if the motives are questionable.
Access Hollywood: From an actor’s point of view, what do you make of Loras and Margaery’s relationship?
Finn Jones: Especially now that Renly’s gone, Margaery is someone that Ser Loras can really turn to, and I think it is a very real, loving relationship… As siblings go in the books, [they have] probably the most genuine relationship. There’s no real politics behind their love for each other as siblings… I think they really do respect each other and want the best for each other. I think they also realize that they’re in this world and if they want to survive and… succeed, they have to go into the politics of it.
Access Hollywood: Margaery married Renly, but wasn’t trying to steal her brother’s man.
Finn Jones: Yeah, there’s nothing ever like that. Ser Loras and Margaery both kind of understand the game they’re playing and even though maybe they don’t like it that much, they’re doing it because it’s what has to be done.