They won't talk things out and solve anything if Ian continues to compare himself with Brian. The problem is Ian inferiority complex towards Brian. Yes everyone knows he's the reincarnation of Brian but no one is pressuring him to be the same. They even went and withhold the information from him hoping things will play out naturally. Ian's the one casting himself to be anxious and depressed by comparing. I think base on what we've seen so far Jack does love Ian and while we know that part of it is because he's the reincarnation of his former lover we can't ignore that he loves the person Ian of this time. If he didn't then he would've told him about their past together and stop at nothing to restore his memory. Yet instead he stays by Ian side and follow his lead without any pressure. Ian was thr one to initiate all the intimacy we've see so far. Is Jack curious of their similarities of course who wouldn't? The soul maybe the same but they are two separate individuals. The Cardinal didn't give Ian any freedom but manipulate him to stay by his side. Jack didn't do that and I think it's about time the truth about the Cardinal identity is revealed. Either way he must be from the past and had some feelings for Brian whether love or hate to be that obsessed with Ian.