And that friend of mine might blame him for having a bad result. You know that people nowadays are looking for interesting things but then if they fail, they look for someone who's to blame for their actions for having an unfavorable result.
It's already there @OP and you'll never know how he's going to react to the losses. Let him learn his trades and experiences until he's the one to open up to you that he's going to continue or he's already given up. Don't make yourself accountable for that as you've just shared and never encouraged and convinced him to trade. Whatever the result will be, it's his fault.