Just tell him directly, or you will be very angry if he does this. Don't save face for such a person, because his quality is very poor. If you don't tell him directly, he still won't feel that you have another opinion on this matter. Just tell him directly, so as to make him feel better, so that he can't use your things anymore. You can relax without your things. What are you going to do with him? What else can friends do? Even if his friend hurts him, don't be afraid. Why can you make such friends? It doesn't matter if you don't pay, because his quality is so poor, you have to go out to work with him, others will see that your quality is poor, and you have to show this to him directly.