Matt had different thoughts running through his head as he drove his car away from Candy's.
He wasn't sure if he had done the wrong or right thing by walking away from Candy, but this wasn't a movie where he could play the role of being her hero. He didn't want to be with someone with such a horrid past. Even his upbringing wouldn't let him.
He liked her no doubt, and if her past had nothing to do with being involved with a drug cartel or murder, then he probably would have considered sticking by her regardless of anything else, but now he couldn't. He wasn't sure that he could live with the thought that she had taken such extreme measures which had caused those teenage boys to lose their lives. And the fact that she wasn't feeling remorseful about it, was something he couldn't wrap his head around, especially seeing that she was a mother herself.