Dammit, you would post this right before I am heading out the door. There are so many things I want to say. Argghhh!!!
The short version is that I think Deniz is burying his head in the sand. He's avoiding the issue. At the same time he *does* trust Roman. But I think there must be these niggling little doubts and there have been moments where I've noticed him noticing or trying really hard not to notice. Like the scene where Deniz was singing and dancing to the Black Eyed Peas- he was answering his own questions and he seemed a little desperate to not notice Roman's reactions.
I think human beings have a great capacity to compartmentalize, avoid and deny whatever they want to. So I do think it's possible that Deniz can both trust Roman and at the same time have these brief flashes where he knows something is wrong. It's like when one has certain intuitions and feelings that they ignore until it is too late and in retrospect you say to yourself, "I knew it!"
Sorry if this is disjointed, but I'm in a hurry and I really have to go now. More later, I think.