Once the romance begins its flux, that which was “cute” or acceptable becomes tiresome and often miserable, especially when coming from arrogance and an intense need to control. Anyone with decent self-esteem would tire of Lastat’s need for control pretty quickly. Beautiful Louis tolerated him fairly easily because Louis is patient and has the flaw of blaming himself for the terrible things others do as in blaming himself the riots precipitated by his righteous murder of that insidious councilman. 300 years of the most ghastly treatment of Louis’ people created the condition for ending that creatures life. Louis was only the instrument.