well, eventually, they'll figure things out 
here's something i wrote to someone whose intelligence is...
awe-inspiring... she wrote something in her journal which is like a
blog... i'll copy and paste it here:
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I love reading your writings. They are always thought-provoking and
makes me think about life and how things are.
This is no exception.
In the brutal words of my mom, she'd told me many times when I
screwed up, "Experience teaches a fool, but it seems that you are
worse than one..."
Those words bite. Especially when it is uttered by a parent to a
child. However, does experience really teach anything to what is
essentially our core being?
As you have written, we will make the same decisions, suffer the
same hurt, do the same thing again and again because, maybe the
heart doesn't listen and will never listen. For the mind may hold
dominance over the body, find resistance in itself but the heart
will go its own way no matter the consequences.
I'm not sure what prompted your friend to say it is stupidity. From
a very logical view, for problem-solving, for trying to hammer
square pegs into round holes, not learning from experience would be
stupidity. However, when it comes to what you essentially are, the
mind has no hold over that. That, is the difference.
To go against what you essentially are, in order to obtain a
"desired outcome" could, in the beginning seem all good. However,
one whose heart holds sway, will start to question the decision
made. These questions will fester and I would think everything will
eventually end up a mess.
So, maybe "experience teaches a fool but I am worse than that fool"
but this fool has much to teach Machiavelli in terms of true
happiness and fulfilment. For in our journey through life, the
tears, the sorrow and the pitfalls, teach us that when we do
eventually find our way, we cherish and appreciate those who walk
with us, holding our hand, sometimes leading, sometimes following,
but always by our side of their own free will.
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so we hang in there, true to ourselves... the hopeful and hopeless
romantic in me says we will eventually find someone.. and the both
of us are true to ourselves, we will find happiness...