Then I'd say you were really lucky that it worked a lot of times! In Cryptoland, you should always expect to get scammed. Never trust anyone blindly. Sorry that you had to learn it the hard way.
Also, be careful with escrows offered by the counterparty. Scammers often have fake escrow accounts and / or websites. Always use trusted escrow, or – even better – use multisig. There are surely some escrow agents here who offer multisig escrow (2 out of 3), this way, you can ideally run the escrowed trade without the escrow's knowledge. If everything worked well, trade partner (1) and you (2) create the multisig transaction, and if there are any issues, the escrow comes in and takes the part of (2).
thanks bro very much,I will need to be more careful, and use escow.