Miley Cyrus doesn't think her relationship with Liam Hemsworth is "strong enough".

The 23-year-old musician has reportedly called off her engagement with the Hunger Games actor as she has fears their bond won't stand the test of time.

A source told Life & Style magazine: "Miley said she didn't feel like their relationship was strong enough to continue with the [wedding] plans. Liam was completely devastated and still is. He won't talk to anyone about it and doesn't want to believe it's real."

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The news comes after Liam, 26, had reportedly been trying to get the Wrecking Ball hitmaker to tone down her party life style, and the blonde beauty was tired of him "making her hide who she truly is".

The source added: "She was screaming at him, telling him he was holding her back and making her hide who she truly is.

"She's told friends and family that she doesn't think their personalities mesh anymore. She's a free spirit and full of energy and she's starting to find Liam a little boring."

There's still hope for the duo though, as this isn't the first time they've hit a rough patch in their relationship. The pair ended their previous engagement in 2013, after having dated for four years when they met on the set of The Last Song.

Meanwhile, the We Can't Stop singer - who identifies as pansexual - recently confessed that her first relationship was with a girl, and claimed she "didn't understand" her sexuality when she was growing up.

She said: "My whole life, I didn't understand my own gender and my own sexuality. I always hated the word 'bisexual', because that's even putting me in a box.

"I don't ever think about someone being a boy or someone being a girl.

"Also, my nipple pasties and s**t never felt sexualised to me.

"My eyes started opening in the fifth or sixth grade. My first relationship in my life was with a chick. I grew up in a very religious Southern family. The universe has always given me the power to know I'll be OK.

"Even at that time, when my parents didn't understand, I just felt that one day they are going to understand."

- Bang! Showbiz