What effect is created by the juxtaposition in lines 12-13? Romeo and Juliet, Please help!

What effect is created by the juxtaposition in lines "Alas, that love, so gentle in his view, Should be so tyrannous and rough in proof!"?

The contrast emphasizes that love always brings good feelings.

The contrast illustrates the dual nature of love.

The contrast emphasizes that love is is cruel.

The contrast clarifies Benvolio’s dilemma.