Well imo was kind'a your fault but is true too that some guys just dont care they just move to the left or right and dont care. Many times is not about just move is just more like a slide slowly to the back of the group. If you are going behind somebody do it at the right side, nobody will move to the right if they want to stop or go to the back of the group suddenly because at the right usually there is no room.
Good luck next time
