I got negative but as people can see the reference doesn't link to my account
Yes it is directly related to your account.
BitcoinGB1106 tried to sell BTC for PayPal using you as escrow.
markj113 asked you to confirm whether BitcoinGB1106's claims were true and
you confirmed here.
Or is that quoted message posted by him fake? I have much more reasons to believe him instead of you.
This means BitcoinGB1106 and you were colluding (or most probably are alts of each other) to make another user send their money to a newbie first. This is a big red flag which requires a warning on your account.