(Chapter 11) Why do you think Ponyboy says he was the one who killed Bob?

Ponyboy was at the scene of the murder and helped Johnny flee. in the chapter while looking at Bob's picture in the yearbook he states, "I could begin to see the person we had killed.",which goes back to his current mental state. In his current mental state he is assuming the responsibility of Bob's death and is in denial of Johnny having died also, so as a methods of dealing with both of these deaths he denies Johnny had killed Bob and assumes responsibility for it.

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and also the mystery girl it might be someone that she might know in her school