The 27-year-old recently split from Chris Brown, 26, following news of his secret love child, daughter Royalty.
But before that Karrueche was in contestant competition with Rihanna, 27, as it seemed Chris just couldn't make up his mind about who he wanted to be with.
Appearing on radio show Real 92.3 LA, Karrueche admitted it's hard being compared to someone like Rihanna.
She said: "We just dated the same guy, and that's kind of what it is. It's always a competition thing and they compare us, but she is Rihanna.
"She's a pop star and she's beautiful and she makes great music, and I'm just me and I'm growing and working into myself. You can't compare us because we're two completely different girls."
Despite having constant reminders of him everywhere, Karrueche admitted she is trying to move on from Chris.
She continued: "I make it so we don't have to cross paths so it's not awkward.
"But I do get on Instagram and there's people tagging us, or I'll hear a song or something… I kind of just have to block it out."