He said that he needed to login to my blockchain so that he could link up his mining software to my account.
I mean, isn't it very obvious yet with that line itself? Since when did you ever need the login credentials for your wallet to receive BTC?
I just can't comprehend his sense of reasoning because he needn't have to ask this in the first place because there is no free lunch dude! Why didn't you rather pay him to teach you how to trade ? Trying to find the easy way always is a sign of greed and laziness and the greedy are the most susceptible to scams like this.