Me and my boyfriend have been going out for over 1year and people have been saying that he has been flirting?

me and my boyfriend have been going out for over 1year and people have been saying da he has been firlting with my best mate but all ma m8s have been sayin it anit true but then al his mate r sayin its true and he is now buying me loads and saying that people hu say he has are stupid what should i do ?