Great analysis rumplegoldfan. I like the idea that Regina blames Snow not only for losing her love, but for who she became as a result. Even she recognizes that she has done “unspeakable things.” I have heard a lot of speculation that Regina will end up killing Cora, and I think this is a good bet. What if Regina’s line of thinking goes basically, “Snow prompted my mother to destroy my love and break my heart. This caused me to kill my mother, and what kind of monster kills her own mother? A=B, B=C…..Snow made me kill my mother and turned me into a monster (or my mother, which is the same thing).” Twisted logic to be sure, but I think it fits Regina’s thinking. Following that thought, Snow also caused Regina to killer her father, whom she did love, and who loved her. This was after she had already decided to enact the curse, but I can still see Regina putting that on Snow.
I would love to see Regina admit to all of this at some point. Maybe Snow herself, or Emma, confronts Regina (once it is all out in the open) and says, “You did all of this just because you lost your love? Do you think you are the only person who ever had a broken heart?” And Regina says, “Of course not. I used to be a good person and now my heart is a blackened little cinder and I kill without a thought, even people I care about. That is what she did to me.”