But if you didn't listen to them, assuming you have bought 1 bitcoin and still holding your bitcoin until now, you could profited $7500 from your investment (almost 2x) just waiting for 3 months.
If he knew that the price of Bitcoin is going up in the next 3 months, I bet he wouldn't sell it either. Nobody knows the future, so either he gets the profits or he got rekt. Every choice comes with a price, but if his aim is trading, then anything more than +15% should be enough imo.