Hollywood is a very strong machine that needs, and in... especially with female actors, fresh flesh. It's that cruel. But that's the way it is.
“No man who is not willing to help himself has any right to apply to his friends, or to the gods.”
“As they say, there are two rules in improv: Never say no, and never ask why. When another actor asks 'Why?' or says no to something you're suggesting, then it's very clear that they're putting the onus on you, because they're not comfortable with it themselves.”