Well 'crush' isn't the real word ... You see you can never truely forget someone you actually loved, so its silly to try to do so ... The only cure is acceptance and actually giving that space to a very small corner in your heart ... so small that it doesnt affect any one of your later vital life decisions. That is what I think happened.
As for SS .... Sasuke did a total 180 about his feelings towards Naruto in 698 and so it is not a really surprise to me that it extends to other people too. Not to mention there is VERY VERY important parallel here, by his Sasuke's own words he was trying to emulate Itachi who he at that time saw as the true form of Hokage .... And you remember what Itachi did? He killed his parents and genjutsued the brother he loved above all else for the greater good .... In parallel Sasuke Genjutsued Sakura and tried to kill Naruto for what he percived as the greater good. This is the subtle things that people miss when they see only what they want to see.