It Happened to Nancy

In my last blog i stated that i thought Collin was a nice guy but after reading on i came to find that he was a ignorant jerk. I say this because after all the time that Collin and Nancy were hanging out and doing fun things, Collin betrayed her. On one particular night Nancy was supposed to go stay the night at her friend El's house, but Collin wanted to come over instead so Nancy told Collin that he could and Nancy then called her friend El's mom and came up with the excuse that she had really bad cramps and didnt really want to come over. Nancy was so excited that Collin was coming over she wanted her house to be clean so Collin didn't think anything bad of her and she set the table nicely she said it felt like the two were playing house. Well after Collin arrived there he and Nancy talked, ate dinner, and carried on a while. The two were drinking wine coolers and Nancy seen Collin mix one of the drinks with something else but she didn't know. Next thing Nancy knows she is being carried into her mothers room and being laid down on to her mothers bed. Nancy screamed "No" over and over but Collin wouldn't listen to her. After Collin was done raping Nancy he just got up and left, never said bye, i love you or anything, not one single word. Nancy said her whole body hurt and she felt disgusting and kept worrying because she thought she had done a mortal sin she felt as though her soul had died.
So far since I have read this i keep wondering what is going to happen next in the book. I also keep thinking why would Collin do this he was really caring, sweet, and thoughtful earlier in the book so why change now?