Second, considering your present situation, can you still lend him money? You borrowed money from the bank at a high interest rate. Obviously, you have no extra money to lend to your friends.
Third, since you say he is your best friend, he shouldn't do it. Imagine that you can withdraw cash by credit card, why can't he do it by credit card? But also let you bear the risk of such a high interest rate. I suspect that he is your good friend.
Fourth, I can see that he has broken his word. Do you trust to lend it to him?
Fifth, I hope you are cautious, cautious!