theres all ways a chance that he'll turn evil but i dont think we no every thing about the snape trust thing dumbly got going on with him coz i dont think much could fool dumb.

plus look at all the opotunity that snape has had to kill harry and never did.
i think that snape hates harry for wat james and him did to each other but i dont think snapes as mean as he seems.
and look at POA moive wen haryy, ron, hermione are about to get hit by the werewolf and snape steped in front to protect them that wasnt in the book i think that could be a clue that snapes mean but he dont wanna kill harry.
i think snape will help harry fight voldy