Why are the good ones stuck with shitty people?

So there's this girl who I just can't seem to get out of my head, and it's quite possible she just might be out of this world....but of course since nothing good ever happens to me without their being some bitch of a snag to complicate the shit out of it, in this case she's got a b/f.  Normally that right there would be enough reason for me to just back away, but the fool she's dating just doesn't respect or trust her any and she deserves so much better then that, seems right now she still think's there's a chance that he'll wake up from his self-centered trip and start treating her right, but I've seen the type before they don't change a bit, not once not ever so for now I'm just gonna play it cool, eventually she'll get to the point where she just doesnt wanna deal with his shit anymore...though I'm hoping for her sake she pulls the plug before that....once you get to that point it's done some serious long-term damage.  

Ah well....time will tell