In a midsummer night's dream, why does lysander, upon waking up, say that he now loves helena, not hermia?

Ahelena has confessed that she, too, is in love with him.

Bhe and hermia have had an awful fight.

Che realizes that he and hermia will never be happy because her father does not approve of their love.

Dpuck dropped love juice from a flower in lysander's eyes while he slept.