The reason that Kate took a dislike to Alex was that he didn't show an interest in her during the first week or so. She only took up with Spencer in an attempt to make Alex jealous. That failed and she was stuck with Spencer.
Whenever she made attempts to break down Alex's defences and failed she would run off upset and crying and bitch about Alex to the others. :'(
She will fail again and again and continue to have fall outs with Alex.
So desparate to be wanted by the good looking guy!
When ginger entered the house Kate's eyes lit up with the thought that she, the so good looking chic

, would get the new good looking man. He's turned into a gimp, " hi babe", now her attention will be drawn back to Alex who in turn, if given the choice, would choose to be with the gimp.
Confusing stuff!