Do you believe that if you are content with what you have you can't get more?

I mean it for relationships, a friend said to me today that she likes someone but she is content with being his friend for now.
I firmly believe that if she keeps thinking that, then her for now would never end and he might end up with someone else who took the initiative to approach him.
What do you folks think?
Do you believe that if you are content with what you have you can't get more?
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