You may not think you want a girlfriend now, but after you date me, I can guarantee you'll want to lock it down. How do I know? I am the gateway drug to a relationship. Like how after-school specials warn you about the dangers of weed, I will unlock the door to your relationship desires. Dating me will make you hunger for more commitment. With someone else.
While we're dating, you'll act aloof, distant and slightly morose. You'll be thinking about the last serious relationship you had i.e. the one that makes me think that you actually know how to be in one. But, whoops! It turns out that you're not completely over it! And, whoops! It took us banging for you to figure it out!
And after you explain how you're "really not ready" to go to the movies/zoo/drinks with me anymore, I'll feel mildly sorry for you. I'll think, "Geez, that last GF must have done a number on him." And then, like a docile pothead transformed into a raging crackhead, two months later we'll run into each other at the bowling alley and you'll have another girl on your arm. Suddenly you're cured of your relationship ills and you're hooked on the stuff! Oh look at you being such a devoted and charming boyfriend laughing with her friends, taking her out to nice dinners and showering her with affection. You're a full-blown relationship junkie, by the look of it.
Hey, don't say I didn't warn you. One hit of me and you'll be boyfriend material--for someone else--in no time.