Answer:
They worry about him and search for ways to help him regain his sanity.
Step-by-step explanation:
In Act 1, Scene 2, we can see Don Quixote's friends worrying about his decision to become an errant knight and worry about it, since he was an important man in society. As a way to help him, his friends enter the library and burn all his books of chivalry, hoping that he will return to his normal senses and stop being influenced by these stories.
In other words, Don Quixote's friends care about him and look for ways to help him regain his sanity.