According to Closer magazine, the singer still has feelings for her N-Dubz bandmate and is split between taking him back and letting him go.
The pair ended their 18-month relationship in January after reports that Fazer had been flirting with other girls, including Made In Chelsea star Chloe Green.
And more recently, model Hannah Borg has claimed that she hooked up with Frazer last November without Tulisa knowing.
Sources now say that Fazer is trying to win Tulisa back, but she's unsure how to respond.
"He's on a charm offensive to win her back, and said he'd be prepared to cut all contact with Chloe [Green] if that's what it takes," an insider tells Closer.
"Tulisa's in turmoil. She was starting to get back on her feet and move on, but now she doesn’t know what to do.
"Eventually, she gave in and texted him back, saying how she wouldn't play second best to anybody, and he insisted Chloe was nothing to him.
"Tulisa's been in tears, asking why he can't just let it go."
The insider added: "Her friends are urging her to move on, but there's still something there, so she's torn."