As Good as It Gets movie plot

The writer Melvinis an old man with a weird temper with obsessive-compulsive disorder. He has no family or friends, and he keeps himself in the house all day to write novels. His life is as accurate as a clock, and he can't stand any interruptions. Melvin’s neighbor Simonis a young gay painter and has a cute puppy. He has a lively nature and a mild temper, but he is often insulted by Melvin. Melvin only goes out once a day and eats in the same restaurant. Restaurant waitress Carol Connellyis the only one willing to serve Melvin. Carol divorced and stayed with his son Spencer. Because Spencer suffers from severe asthma, this makes many men who are interested in Carol retreat. One day, Simon's house was robbed, and Simon was also seriously injured. Simon entrusted the puppy to Melvin's care before being hospitalized. As Melvin gradually fell in love with puppies, his psychology also changed. He began to pay attention to the world around him, not only taking the initiative to help others, but also carefully examining his feelings about Carol.