If MS was NOT the shooter then why not tell his best friend that DM shot someone...I would think that the whole I f'd up thing is referring to himself and his own mistakes...if he was truly thinking that he f'd up by just going with DM and being at the wrong place at the wrong time, then I think he would confide in his buddy to try and help him get out of this mess. I still think he was the shooter, I am hoping he told MM the truth about what happened and that she will be able to paint the whole picture.