Just a thought that has been running through my mind........ why did Dumbledore trust Snape...........?????????//

Maybe........ as noted in the HBP snape was an accomplished potion maker and studied well in lessons with slughorn... So however was Lilly James. They would have been in the same class together.

Is it not a possibility that snape liked lilly and when she got together with James this was the basis for snapes increased hatred of him. Maybe Dumbledore knew snapes old feelings for lilly and therefore knew he would never have wished any serious harm to come to her , so believed that he was genuinely sorry when Voldemort used the prophecy to attack lilly and her family!!!!!!!!!!!!!

There must be something unknown obviously between Snape and Dumbledore..

Whaddya think???????????