Who does Lysander love in A Midsummer Night's Dream?

At the beginning of the play, Lysander is in love with Hermia and wants to marry her. However, Hermia's father, Egeus, refuses to give his permission for the marriage, preferring that his daughter marry Demetrius instead. As a consequence of Egeus's refusal, Lysander and Hermia decide to elope. Lysander proposes that they elope to his aunt's house and get married there in secret.
In the woods, however, Puck (accidentally) sprinkles Lysander's eyes with a love potion that makes Lysander fall in love with Helena. He remains in love with Helena until Puck gives him an antidote to the potion. Lysander's love for Helena is not a genuine love—as his love for Hermia is—but is merely a consequence of the love potion. Lysander is always really in love with Hermia.