When you went to the same school with Stu, you didn't cross paths often before the first Halloween. Since you both love horror movies, the two of you simultaneously came up with different ideas on how to spend Halloween and since then you have been inseparable

You've been talking for quite a long time and you don't suspect him of murder (maybe you do), but in any case he doesn't want and isn't going to kill you! You are his best friend! And you often hang out at each other's place watching horror movies.