I like honesty and directnes. I a chick wants to get married, tell the guy. "hey, when you gonna ask me to marry you, Dick?". Or just ask him yourself. If he says no, or whatever derivative thereof, it is the chicks place to tell him that she would wait until he is sure, or that she wont wait till he makes up his mind, that this is not what she wants out of life, and that she is gonna find someone else who will commit.
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The age old trick of "i am pregnant" seems to work wonders still.
The moment I find out a girl lied to me to get me to marry her, I'm outta there.