The stylist ended her on-again, off-again relationship with the 'Loyal' hitmaker last week following a heated argument and stopped answering his calls when rumours began swirling he fathered a child with one of their mutual friends.
A source said she was completely ''blindsided'' by claims the 25-year-old singer has a nine-month-old daughter with 31-year-old model Nia Amey.
But the insider told gossip website TMZ.com that she thinks the ''baby drama'' has given her the strength to cut ties with Chris permanently.
The singer is said to have taken a DNA test that conclusively proved he is the tot's father last week and he has allegedly already made a financial agreement with Nia.
The 'Turn Up The Music' hitmaker has yet to comment on the rumours, but Karrueche appeared to confirm the speculation when she announced their split on Twitter on Wednesday (04.03.15).
She tweeted: ''Listen. One can only take so much. The best of luck to Chris and his family. No baby drama for me.''
While the brunette beauty appears to have brushed off their split, sources recently claimed she was hoping to marry Chris.
One insider said: ''Of course she would marry Chris. There's not one man she would rather spend the rest of her life with other than Chris.''
His new album Underneath It All is out now.