I’ve found that most of the time when someone tells me that they thought I was their friend, it’s because I don’t want to do something no good friend would ever ask for.
In high school I knew someone who worked at a restaurant with their best friend. One night, the best friend stole all of the checks in the register instead of dropping them at the bank. This was the second dumbest crime I’ve ever heard of. It’s not like he could deposit them to his bank account or anything.
Anyway, the check thief went to the guy I know, asking for help covering this up. The person I know suggested that he turn himself in, which caused the thief to play the “I thought we were friends” card. In the end, the thief got arrested and convicted, and the person I know, whose crime was not immediately turning their friend in, lost their job.
On the positive side, this was the event that taught me it’s possible to learn from other people’s mistakes, and this gave me an opportunity to learn from several mistakes in one go.