Lysa was just a bait of littlefinger by which he created the war between starks and the lannisters. Couldn't believe all those chaos was actually created by him. Like he said, "chaos is a ladder." Ufff! I miss the series a lot. All those Political plots, characters, their efforts for the throne.
And Sansa still got justice for Lysa. 3 screws missing and all. Littlefinger had such little concept of loyalty he couldn’t even do the right thing which would have been to either marry or send Lysa away.
He may not have wanted her but she obviously was the only woman we meet in show that had genuine feelings for him for better or for worse and he kills her so he can keep gaslighting and sexually extorting a child. sounds about right.