Truth and Lies

You've uncovered the truth behind Cassandra's missing letter. Gaga has something to tell you.

Gaga, who's suffered the sneezy wrath of the Truth Lollipop, tells you that Cassandra's cherished love letter, which she's never opened, is actually a break-up letter. He wanted to protect Cassandra, but it's now up to you to either tell Cassandra the truth or not.

Cassandra's missing letter incident is over for the time being. Gaga's friendship for Cassandra must be great for him to got to such lengths to protect her feelings.
What's the right choice? Telling the truth knowing that it would break someone's heart, or telling a lie so that she can be happy?
It's a tough question to answer.