Love Is Blind

What does Macbeth see in Lady Macbeth? How did they even get together? I am speculating it was an arranged marriage because he can't be a great warrior yet have no clue that he is married to a maniac. Macbeth must trust her and believe her, because he was sane until she got a hold of him and told him to do crazy things such as kill a king who had done nothing to provoke him. The audience can see Lady Macbeth is evil and cuts herself off from her own conscience, and maybe that is why Macbeth listens to her, but at some point, he must realize she is off her rocker. She is bloodthirsty.