Asking for a friend: I’m in a situationship with a guy but I’ve caught feelings and want us to be exclusive and he doesn’t. Will he change his mind?

Q: I’ve been in this situationship with this guy for a few months, and it’s worked well until now. The issue is, I’ve caught feelings, and he doesn’t want to make things official or exclusive. I am trying to keep things the way they were, but I can’t help thinking we would make such a great couple. He just wants things to stay as they are. We have such a good connection, and our sex life is so good, so I don’t understand why he won’t just even try an exclusive relationship. All our friends say we would make a cute couple but he shrugs it off. I feel so bad and just feel like he can’t see how good it would be. I spend my time trying to figure out my feelings and daydreaming about us together, and then I feel so upset that he doesn’t want this. Is it me? Will he ever change his mind?