Yeah, I saw that version too, but I'm not quite sure what you mean. Isn't he just saying he'd given up on love, until he met the Inquisitor?
His answer wasn't what I expected because I never gave this Cullen/Warden thing much thought.
He already said he was serious for the Inquisitor. And now he implies that he had that same feeling for the Warden. So, he was actually serious back then? That kind of feeling can linger, especially after he almost screamed like a lunatic that all mages should be killed when that one particular mage was in fact there to rescue him.
I guess it's easy for many people to say "Well, that was a looong time ago, now I care about you more than anyone", but maybe not so easy in Cullen's case. Guilt intensifies emotions and memories. I didn't take his "crush" in DA:O seriously, now I feel sorry for him.
Of course this is only my interpretation 