For the record, I still really like Cass.
I think she's a neat character, and is probably going to be good friends with my Inquisitor. I think Cass and Cullen would have a lot in common, too. I can see them being friends.
Exactly. I want him to be interested from the get go, but I want him to try to hide it and for it to come out in subtle hints over time. He'll have his reasons for being reserved, perhaps he's worried that he'll lose her/him to his war and/or he feels cursed, like everything he's involved in goes to sh!t so he doesn't want to see our protagonist get hurt because of him. I'd also like to see him quite closed off initially (not in a moody, cold way though) because he's had to be for so many years after all he's been through. Add in just a hint of shyness/awkwardness and I'm golden!
I hope this is indeed the case.
I really like the idea of gradually getting to know the person, being friends first, building trust - basically how it was described in MD's video.
If the LI doesn't show some interest too, though, my Inquisitor would feel like a creep if she was in relentless pursuit. I hope that even if the PC ends up doing most of "the work," the LI is at least sending signals that the attention is welcome and the attraction is mutual. It can be subtle at first, but just signs that your Inquisitor isn't a stalker who struggles to understand that no means no.
Basically, I just want the LI to be at least sending some encouraging signals, even if it takes some time to get to actual romance.
Y'know what I'd like him to address? Why he let Hawke 'n' co go if you played pro-Mage. Was it because he had bigger things to deal with? Was it because he/she was a fellow Fereldan? Because he was related to Amell (if you Warden is one)? Was it because he considered Hawke to be a friend (if you were nice to him), was it out of respect? Does he regret it?
My headcanon for it was that he was in the middle of a crisis of faith because of what happened to Meredith - as people have said, not faith in the Maker but in the Templar Order and whether it is upholding the principles Cullen stands for and it was supposed to stand for. In the templar ending, Cullen wants the accused mages to be spared because he has doubts about their guilt. I see letting Hawke go as also based on doubt. If Cullen is no longer sure he's fighting for the right thing, he's not going to kill for principles that may be wrong. I see Cullen (as of DA2 anyway) as a person who sees killing as a last resort, sometimes necessary but he's not going to take someone's life if he's not positive he's the one in the right.
Even if he thought he could win the fight, at that point Cullen may not be sure he wants to because everything is in doubt, including how templars should deal with mages.
I am of course fine with being wrong about this.
It would be neat to hear the real explanation.
Lol, I feel really proud of him too. Weird to feel like that about a fictional character.
I feel that way, too. He's come so far!
Do you think Cullen will be taking lyrium during the events of Inquisition?
I wonder what sort of withdrawal, if any, he will be experiencing. 
I'm not sure if it's even possible to quit lyrium, because even if you wanted to the physical effects of lyrium deprivation might be too much to survive. I've wondered if Cullen might need to take lyrium for the rest of his life, and just moderate his dose to try to mitigate or delay the dementia that results when he's old.