I think his is scammer, because yesterday his want buy from me btc, but now i see his block me on Telegram and delete all messages.
Please, create a new topic here ---->
Reputation , and provide detailed info.
First you need to ask if he is ready for Escrow service or if he is ready to send to the first people with a good reputation, then call him a scammer.
the person who set him a negative trust has a red trust, so this is pretty controversial.
You must differentiate between making exchanges with reversible/irreversible payment methods.
Transactions can be reversed using (Paypal & others) so using it to make transfers will cause losses and thus trust the second party will not scam.
Using escrow in such cases will not make any difference.