Here's a mind-f--k for you to ponder:
Why does one continue to spin plates if he has started dating a woman that he thinks might be "the one" or "relationship material?"
Simple answer, right? It's so that he won't become so needy and focused on this one chick that he starts doing all the WRONG things to lower her interest and scare her away. Or, as this board would say, "so you won't get one-i-tis."
Ah, but here's the rub: what if, at the time of meeting said woman, you don't have any other plates you're currently spinning? And what if, as you're dating her, you still do not manage to find other plates to hook up with? How does a guy then prevent himself from becoming that needy, insecure guy who develops the dreaded one-i-tis?
The answer to that is also simple in theory, but harder in execution: he has to be a guy that is ALREADY confident in himself, and feels in his gut like he could get another woman in his life in no time flat, were this current situation not to work out to his liking.
So then: how does one get to the point where he can date a girl, regardless of if he has other plates lined up or not, and still manage to not do the things that will make her LOSE interest?
Well... I have a whole site dedicated to that (see signature)... but one of the ways is to start believing that you DO, in fact, have worth. If you believe you have worth, it will exude from within to the outside, and it's an energy others around you can pick up. If you feel you have worth, you are more confident; if you are more confident, you are more of a positive person; if you're more of a positive person, you are someone that others - especially women - will not only want in their lives, but would not want to risk giving up. YOU become the prize, not them - and YOU being the prize it what allows you to date however many girls you want at any given time, without fear of consequence.