Honestly, as much as people hate on this, for everyone doing illogical decisions.. thats.. kinda life isnt it? This started when booth of them where iirc 13 or 14 years ago, i dont think anyone here could have made any rational decisions about what happend at that age, yes its overly dramatic, BUT its not 100% illogical, especialy Boy A not confessing years later, at some point, you are just so caught up in your own lies, that you cant escape from it anymore, you know its wrong, but you try to justify it, with whatever means necesssery. As a child, they murderd someone, and on a snap, the boy decided to protect someone, at the cost of his own reputation, and that of his family and friends, he did a stupid thing, he continued to do stupid things, trying to justify his stupid decisions from all those years ago.
the Girl, obviosly she was scared, and considering her mothers reaction at times i kinda see why she would be unwilling to release the truth, evne just about the rape.