People are willing to do some pretty crazy things for love. Countless stories, songs, movies, plays, books, and I'm sure scientific breakthroughs were made because of this fact of life.
Now some people do wild things, like that astronaut charged with attempted murder who drove from Houston to Orlando wearing a diaper, all to kill a woman she thought was a romantic rival hell-bent on stealing her love interest from her.
Then if you wanna get all fictional, just look at Thanos in his Marvel comics appearances. He wants to wipe out half of the universe's population all to please the apple of his eye: who just so happens to be Lady Death. That's some crazy love.