Much as I like having these insights into his character, when I play the game I really want to try and respond the what my character hears in game, not what I know.
I try to play my characters using as little meta knowledge as possible. They have a certain background, certain experiences, have known certain people, and it isn't likely that they would make comments regarding such-and-such, or decisions based on that thing or the other when they don't know about it.
I've seen most examples of other players using meta knowledge during discussions of DAO, particularly with regard to Alistair and Loghain discussion. I find it highly unlikely that someone's character would have whatever insight, enough to base a decision on. But... that's just me.
Slightly off topic for Dorian, but how does Cole know what the other person thought? He's looking into Dorian's mind, yet he appears to tell him what the other party was thinking at the time of Dorian's thoughts. Can he actually home in on someone's memories regardless of the distance provided they are linked to the person present? Or have I misunderstood such comments as "He would have said yes."?
Dr. Doctor already answered, but I'll elaborate:
Cole: "Tama, how will I follow the Qun?" Her hands, strong but gentle, rubs the stubs where the horns will be.
Cole: "You are strong, and your mind is sharp. You will solve problems others cannot." She smiles, but sadly.
Iron Bull: Looks like my old Tamassran was wrong. Bet she's pissed one of her kids went Tal-Vashoth.
Cole: Agents with hushed tones. Eyes stinging. Forms to fill out, course corrections. Reduce risk of similar losses.
Cole: I remember the little boy, too wise, eager to help. Words break in small, secret spaces. He got away. He got away.
Iron Bull: How could you know that? You've never even met her.
Cole: Your hurt touches hers.
Iron Bull: Well, that's, uh, creepy, but... Thanks.
Hm... extrapolating from the specific line, "your hurt touches hers," makes me wonder if Relinus was also interested in Dorian as well (in a romantic way, not just a sexual way), and if Relinus isn't also in a similar position to Dorian with his own family.
It seems absurd to me to want to know so much more about a single line of throwaway dialog in a banter that doesn't ultimately mean anything. But it just seems to open up some interesting possibilities, primarily because of how Dorian reacts to it.
I'll say one thing, there is no way in hell I would touch that in any sort of fanfic. There is no indication whatsoever as to what any of it means, for either guy, so I think trying to come up with something would be a disservice. This is in comparison to Dorian's own feelings about himself and such, which I think we have a lot more to go on than this small bit of information.