It is related to the scarcity mind set.
It means that you have run into a pretty girl, e.g. a seven or an eight, and that you are afraid that you will never find one again. So, you overly start fixating on getting the one specimen that you can see in front of you, right now. That won't work.
The solution is to use an effective protocol in order to switch to an abundance mindset.
A friend of mine is doing that right now, on my advice.
He has placed an online advert on a job site for a "university student to teach local language to a foreign expat."
On average, he interviews around 5 girls per week for the job (he doesn't reply to male candidates). The idea is to hire really pretty ones for one or a few hours per week of teaching, so that he can learn a bit more of the local language while sitting together in some kind of Starbucks and drinking coffee. My friend intends to use two or three of these "teachers" simultaneously. If after a month, no beginning of a romantic connection has started emerging with a particular "teacher", then he will replace her by another one. Other and better.
Since the probability that a girl reciprocates to his own initial romantic interest is non-zero, it is a numbers game that always finishes in a win. You can prove this property for the protocol described above from Pascal's Gambler's Ruin Theorem. In the meanwhile, he will also pick up bits and bobs of a local Asian language. That is also useful. I speak local language fluently, and I use it all the time to pick up women.