The "Because of You" PV is one of my favourites because of all the symbolism in it, even though Ayumi doesn't look too pretty in it. XD
What I think it means is the guy playing Ayu's boyfriend was just using her for sex and forgot the true woman he fell in love with. In the PV, Ayumi is constantly replaced by her other dancers representing how the guy playing Ayumi's boyfriend lost sight of his true love in the blindness of his lust. Only when he saw Ayumi on the TV, he finally realised what he had done, and tried to fix it with flowers. BUT IT WAS TOOO LATEE. O:
Well that's what I think anyway.
