@rumplegoldfan: I felt like Regina was gloating over the fact that she’d gotten her revenge by keeping David and MM apart for even longer. She seemed to be taunting both of them and Emma. She said something like, “If MM didn’t kill Kathryn, then who did?” She had a smirk on her face like she believes she can get away with such an evil act. Also, she seemed to relish the fact that MM was behind bars for a crime that Regina herself committed. It was her sense of revenge kicking into overdrive. Perhaps, she does have a guilty conscience somewhere, but it’s like her evil side is kicking into overtime because she observes her grip of power growing weaker as Emma unbinds the curse. First, Graham sided with Emma, then Hansel and Grettle’s counterparts were reunited with their father, Henry always sides with Emma, and now, Kathryn has told David he should be with MM (the very exact thing Regina wants to thwart, the reason she enacted the curse in the first place).
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy