(digitalspy.co.uk) - R& B star Chris Brown has revealed that he is frustrated with constant questions about his relationship with Rihanna.Brown, who has been spotted kissing the 'Umbrella' singer in public but never confirmed their romance, told WENN that questions about his personal life should be off limits.He said: "Nobody wants to focus on what's positive, they want to know about my personal life."Every interview I do, they're like, 'So, how are you and such and such doing?' And I'm like, I don't know you, why you all in my business? So that's my take on it personally."