why Armand loved Lestat after what he did to him?
You could also ask Why did Lestat love Armand after what he did to him?
They’ve both done terrible things to each other but there’s a sense of peace now. They sort of consider themselves brothers. Deep down, I think Armand finds Lestat inspiring in his indomitable nature, and Lestat is more than a little intimidated by Armand’s intelligence and Mind Gift. They’ve both suffered a lot in their lives and afterlives and had to find reasons to go on.
^Here’s Owl!Armand and Cat!Lestat [X]
Lestat: “no means NO armand” *boops his nose*