2013 hobbit report held in german : tauriel might have a very secrete crush on his king, thranduil, who had wife ( she might sail to west or died long ago), which appears he is widower,tauriel declared herself to him, but he observerd his son grown found of her, and because he must remain loyal to his wife, he rejected which trigered her angry that resulted in the release of dwalfs.
thats how it dictates in the trailer 2 of Hobbit,
" Legolas has grown very fund of you" i observerd my son's feelings for you.
" do not give hope when there is none") in relation to us, no hope.