The problem is if you play enough of parts in films that are sort of more financial products than anything or films in which the girl is a thankless, thoughtless, underwritten character along the way, you're no longer the person who had something fresh or vital to offer. I think it really does start to diminish some part of you, to put yourself through things you don't really want to be doing.
One of the great pleasures of acting is surrendering to someone else's point of view of the world - living inside a character and a story that never would have come out of your mind or heart.
It doesn't happen all the time, but in the moments where you really lose yourself and you fall into this character, it's like time travel.
