A source close to the 25-year-old star told the Belfast Telegraph newspaper: "Pals have told Rihanna not to get upset about Chris and Karrueche. They think the best revenge would be living well and looking good, but so far Rihanna's answer has been to party the pain away.
"It's understandable that she'd want to escape her feelings on this but she's taking it way too far. Everyone around her wants her to get some help -- they're genuinely worried about her.
"She's not in a good place and looks like she's self-destructing. Her friends are really worried about her and think she needs to take time out to detox and refocus."