The 'Bodies' singer is said to be desperate to tie the knot with Ayda Field, but she has been too scarred by her mother's divorces to consider Robbie's proposal.
A friend explained to Britain’s More magazine: "Ayda loves Robbie with all her heart and would do anything for him apart from walk down the aisle. The topic of marriage cropped up in their first few months together, which is a huge leap on Robbie's part, he finally realised he'd met 'The One'.
"He'd love a wedding. It really would make his life complete after all the madness that's surrounded him. But Ayda has seen her mother divorced twice and is all too aware of the pain it's caused. She doesn't want to end up going the same route."
Despite Ayda's refusal to walk down the aisle, the couple, who have been dating for two years, want to have children in the near future.
The source continued: "Ayda is planning to be a stay-at-home mother, cooking, cleaning and taking care of Rob. They want at least two or three kids and have names picked out already.
"It seems like the perfect fairytale. If Ayda would change her mind about marriage, it'd be the icing on the cake for him."