What is the main conflict in Lolita by Vladimir Nabokov?

The novel's main conflict is centered around Humbert Humbert (H.H.), a middle-aged European scholar of English and French literature, who is obsessed with "nymphets", nubile girls like Lolita Haze and before her, Annabel Leigh. His obsession has gotten him thrown into prison facing trial for crimes not yet described.... Lolita, is the story of his depravity. In the end, Humbert admits that his "pathetic" obsession with Lolita "broke" her life and repents.