Well, I wrote email to Steam Support and to Gabe Newell. I am waiting for response.
@illusioN there was no link it was:
"Hey there, I saw that you have good items in your inventory, wanna trade?"
After I saw this message I immediately kicked him.
CS:GO items are gone and some money dissapeared (was on Steam, like 10 Euro)
@Ultimhate
Anything else?