You are a victim of a very common scam. Your money is gone, do not give them any more.
I'm willing to bet he had no money on that account whatsoever.
It's a commons cam where they send you a message that you supposedly have some hundred thousand or even millions of dollars in a forgotten account and now you can get them back but you need to pay like $50 for it.
After 6 years since I almost became a victim of this scheme, these scammers are still using one of the oldest and most used scamming schemes. This is because so many newbies are not aware of this scheme.
The domain just got dropped and somebody claimed it, weird since it's a .net extension so they either paid extra for it or even weirder nobody was interested in it despite the simple and cmon name. If I were bitvest (the casino) I would have had those domains on my watchlist.