You can see if it is partly borrowed or if the full text is almost carved from the same template as your paper. If it is partially borrowed, it is not plagiarism. At most, I was inspired by reading part of your article and wrote it. In this case, you don't have to care too much. If the full text is similar to yours, it's a bit plagiarism. You can tell him directly, but I don't think your friend will do that. He hasn't been back to the dormitory for two days, which probably has nothing to do with you. Something may have delayed him from coming back. Don't think too much. If you really have doubts, you can send him a message and ask him why he didn't come back for two days. As his friend, you are worried about him. Look at the reason why he didn't come back. You'll know, won't you? Because of you, you don't have to worry about yourself. When the problem comes out, you should think about the solution, instead of always keeping yourself in anxiety.