Nicole Scherzinger reportedly feels like Lewis Hamilton is "messing with her head".
The former Pussycat Doll and the Formula One star started dating in 2007, but broke up and reunited several times before calling things off for good in July this year.
Since then they've been spotted meeting up for "crisis talks" and it was recently reported Lewis promised Nicole children if she takes him back.
Now it seems the sports star has changed his mind about getting back together, leaving the 35-year-old in a confusing position.
"Lewis is blowing hot and cold and Nicole feels like he's messing with her head," a source explained to British magazine Star.
"She was so happy when it looked like they were getting back together, but now she doesn't know where she stands. It's so hard for her, because she really loves him and has invested so much time and effort in the relationship, but she can't wait forever.
"The worst thing is that she doesn't know why he's had a sudden change of heart. Only recently he told her that he wants to start a family with her."
Nicole has come under fire for her partying recently and she was even accused of slurring her words on an episode of The X Factor UK, although producers denied she'd been drinking.
As a judge on the British talent show, she's enjoyed a night out with fellow panel star Sharon Osbourne and was even snapped giving the 61-year-old a kiss on the lips.
"Nicole is really enjoying this year's series and had a great night out, but she is stressed about the situation with Lewis," the insider sighed.
"They've had some intense discussions that have left her very upset - which isn't easy when you then have to go on live TV and put on a 'schamazing' front. Maybe Nicole was overcompensating, trying to she wasn't hurting. But of course she is."
One of the reasons their relationship is thought to have suffered is due to Nicole's desire to have children.
Apparently 28-year-old Lewis wasn't feeling as ready to settle down.
"Nicole wants to settle down and have children, but Lewis still isn't sure if he's ready for all that. Nicole is madly in love with Lewis and it's killing her," an insider told British magazine Closer.
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