Why Dumbledore so trusted Snape and a few possible misunderstandings about Snape

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I strongely believe that Snape loved Lily Evens, Harry's mother. That's why he turned from the dark side to Dumbledore when Voldemort killed Lily Evens. That's also why Snape hates Harry. Acctually, seeing Harry reminds him  of James Potter, who took Lily Evens away from him, elimitating the possibility that he would marry Lily Evens someday.

Also, remember that Lily Evens was telented at Potions, which would have made Snape like her more, being a potion master in the making.

So this explains why Dumbledore so trusted Snape - He believed of Snape's loving Lily Evens, which will not turn him back again to the dark side.

There stands a possibility, which I sincerely believe, that Snape killed Dumbledore and was back to join with Voldemort on Dumbledore's order. Because Dumbledore said "Severus, please..." instead of "Severus, no...", which is very suspicious.