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Part of it was to use her a scapegoat for all the terrible things he did, but yes, he is also jealous and resentful of Tia because of her legitimacy.
He knows that he was only able to become emperor because of Tia backing him with her title and Lysia marry him and becoming Empress. So in some ways its almost like he kills them off to prove that he can still be emperor without them.
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Lysia and Cedric were not in love in the first timeline. Their relationship has always been brother-sister platonic. They agreed to marry in the first timeline purely for the sake of convenience.
The one Lysia was actually in love with is Lawrence! She understood that a lot of Lawrence's twisted personality came from his insecurity and upbringing and felt sorry for him. While they were married she tried to change him, but he was beyond hope and so jealous and insecure about her power and prestige as Saintess that she couldn't get through (although actually Lawrence was obsessed with Lysia too and that made it even worse).
Towards the end of the novel the central characters also get their memories back. Lawrence becomes obsessed with Lysia and kidnaps her and Lysia kills him.