part of the cycle of crack use is a horrible, overwhelming sense of despair, remorse and self loathing. it's a testament to it's insanely addictive qualities that something so deeply depressing could keep calling you back to use it more.
the other thing is that those who use it feel like they are the dirtiest evil creature on the planet...(thus a high rate of nasty sex behavior etc) and why crack houses are so hideous...etc etc etc
the addict, coming out of this self perception and self loathing scum behavior, cannot imaging why in the world you are with them...they can't see the good in themselves whatsoever, especially when they are close to having used, and ESPECIALLY after a good run/binge!!
in fact they start to disrespect/distrust and resent your motives/reasons for being with someone so lowly and disgusting.
then the upswing starts...and the need/want/desire for your love comes on full force...fear of losing it...ESPECIALLY if you represent money/shelter/food/survival needs!!!
its love/hate...its every split you can imagine, its splittedness and only they can sew themselves back together. you can't force anyone to see themselves differently, witness the anorexic who dies thinking they are fat. you especially cannot help someone see themselves differently when they are using a substance so steeped in self hate.