Snape! He trusted you!
Read more Harry Potter QuotesFrom: Harry Potter and the Half-Blood Prince (2009)
Please don't think badly of me when you see it. You have no idea what he was like... even back then.
Every day. Every hour. This very minute, in fact, dark forces attempt to penetrate these walls. This time, I cannot help you destroy it... alone.
Now get out of here at once!