I try try to find out at what day and how it happened?
If you actually forgot, you should go to your own profile then click on the trust rating or the big red scam flag. Click the links. All the info is there.
I did, but around July 2019 is not a day in the real world!

It also is not described how the violation of a non-existing contract happened

Asking to lend BTC worth 10
is not a scam in the real world!
(September 3rd) My suspicion substantiated when he asked me to borrow him 10. For the second time.
I am also not able to find the words
trust and
steal 