Well... it always bugged me how easily Leliana ignores her romanced Warden in Inquisition. She seems a completely different person altogether... if she would had been romanceable I certainly had felt betrayed. One more step forward the detachment and indifference devs show towards Origins, in fact.
There is some point... you ask Leliana about the wardens in Ferelden and she says nothing about the Warden. Even worse, you ask about her past and she talks about her time as a bard, then the time she stays in Lothering and then, she simply leaps to "Then, after the blight...", completely ignoring all the events in Origins.
Don't take me wrong, I like Inquisition, but the treatment of Origins and the Warden in this game feels terrible. A romanceable Leliana would be even worse.
My romanced Leliana has almost the same line (paraphrased) "He's on a quest right now, but we will be together again, never to part after" that romanced warden Alistair and Morrigan do. In addition, my Cousland import had my boy married to Anora and Leliana says "he married her, but he loves me!" indicating she's very aware of his feelings toward her. In Halamshiral she's introduced as the mistress of the king of Ferelden and a veteran of the fifth blight, something she would have to have told them in order to be properly introduced. And in the end, he rejoined her (she was Divine).
Unromanced Leliana spoke of my (canon) Surana as 'a good friend, but that was a long time ago'. How does blathering on and on about the Warden serve her now when she has an Inquisition to look after as a spymaster? The generally loquacious Leliana of Origins has become a lot more reserved than she used to be, kind of a necessary trait to have developed when you are the keeper of secrets.
Even "killed Leliana" speaks of the 'hero' of Ferelden (in less than glowing/affectionate terms).
I think they gave her just the right amount of dialogue concerning someone she may not have spoken to in over a decade.