Kanye West's ex girlfriend doesn't think his relationship with Kim Kardashian will last "forever".

The superstar rapper and reality TV beauty Kardashian are currently expecting a child together, after dating for a few months.

Despite the couple looking super loved-up, West's former girlfriend Brooke Crittendon - who dated the star for two-and-a-half years - has doubts about their relationship.

She told The Sun: “For Kanye, what other person besides Kim Kardashian is there? There’s Halle Berry, J-Lo and Beyonce but they are all taken. She fits into his brand. Part of being untouchable is having what other people want. It’s about saying, ‘Everybody wants her and she wants me’. That makes sense in Kanye’s world.

She added: “I know he has had a thing with her for a while. I’m sure he watched her tape. After we broke up, we caught up as friends and he mentioned her, I knew something was there. In Hollywood, you cannot say ‘forever’. Them being together satisfies them for now. Having a baby ticks a box. She wanted kids and it’s his legacy.”

Crittendon also revealed the reason behind her split from West, adding: “I was very naive. I was a normal girl and in my life you meet a guy, you go on three dates and that’s your boyfriend. But he was a superstar and it got too much for me to handle. I was never OK being one of many — or even one of a few.

She continued: “There was a lot of attention from other women. Kanye was very open and honest but it ended up with me knowing too much. I don’t want to be silly and say it wasn’t cheating because I knew about it."