Hi Jasmine 👋, To avoid sounding flirtatious, you could just say: 'You're a good guy' 'You're a really nice person' 'You're the best!' Alternatively, pick something about the person that you like. E.g., 'You're really kind / generous / thoughtful / funny.' Just don't say 'handsome', or he'll definitely think you're flirting, ha ha 😊