NEVER put all your romantic eggs in one basket
Notice how heartbroken people (or you) are when their One True Love[tm] turns out not to love 'em in return? It's always sad to see someone getting all infatuated and struggling with the old unrequited love dilemma.
When a member of the opposite sex sees you've got a lot of friends and romantic hopefuls, they're more likely to want to get you while the getting is good. In some cases, putting all your hopes into one person translates to nothing more than simple desperation.
Hell, even when you're boyfriend/girlyfriendy, you should at least have a few irons near the fire...
