Is it important to strike while the iron still hot?

I guess i haven't really noticed this girls openness with me for 4-5 months till now. She would say hi to me all the time and even give me the finger wave (?). The other day a coworker told me she noticed how she's real open with me, and so i just got confidence from that and tried talking to her. It wasn't the same feeling i got like all those times. I tried telling her i got a better offer from somewhere else. All i got was cold formal responses like "well great for you i wish you the best of luck."

So that brings the question.
Is it important to strike while the iron still hot?
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