Xofer

Question: In this movie Ashton goes back in his life to change the past. In his final "time travel" he goes all the way back to when he was a kid to tell Kaylee to stay away from him. This means that she would never make contact with him, the events with her and her brother would never take place, and since his lifeline is changed, he wouldn't have blackouts and he would have no need to write in his journals. But at the end of the movie it shows him throwing away all his stuff, including his journals, and setting it ablaze. If he changes his life, how could his journals have been written when there is no need for them? I'm a little confused about the whole journal thing so if someone could help me out, that'd be great.