I agree that alot of Gwen's emotinal state right now has to do with Morgana. Although I think that they were growing apart in Season 2 already. For me in S2 the moment I noticed that was when they were riding together (2x04 I think it was?) because I felt that S1 Gwen and Morgana would have talked about any feelings,even if they involved the prince. Also,Morgana only talked to Merlin about her magic even though she must have known that a)Gwen was loyal to her and b)probably had suspected Morgana having magic the same way Morgana had,Yet she hadn't told anybody... So while S3 is indeed servering the Gwen/Morgana coin that already started with Morganas problems in S2 and her closing off...