You didnt curious why would he said you could gain 300 from 100 in three days? From that point, its kinda hinting the guy was a scammer cause that is a short time to earn that provided that he will not do it on a known process such as trading. Also why would you trust someone to give your bitcoin its wrong move. I hope you already learn the hard lesson. Reflect and focus more on knowledge cause it can be your skills to earn in a right way. Avoid talking to strangers cause majority of someone just pm you is after your money.