How did he steal your steem?
Did he steal your password and hacked into your account?
Did he convince you to send him the money?
Another way?
This place is a heaven for thieves, crooks, con artists and scammers.
This is another reason to why you should not buy steem.
Also, while more steem helps you make more steem, its value goes down, so in the end you mainly wasted time, took risks and paid fees, only to get downvoted and have your steem diluted due to increase of the total amount of steem.
Even if you got 0 downvotes all the time, the value of steem goes down, and more steem will probably not mean more money if you try to sell it.
Think that you bought 2 chickens at 1$ each, and after a year you have 4 chickens, but the price of a chicken went down to 0.3$.
You paid 2$, and if you tried to sell them all after a year, you would get 1.2$.