Taylor Swift reportedly thought Calvin Harris was the man she would marry.

Taylor Swift

Taylor Swift

The 'Blank Space' hitmaker and the Scottish DJ recently ended her 15-month relationship because he was not yet prepared to settle down and have children.

A source told Us Weekly: "She used to talk about their future a lot -- marriage, babies. And although he wants all of that, it just felt a bit like she was all full-steam ahead, whereas he is more of a slow and steady, let things progress organically, kind of guy."

Despite this, the insider suggested there is no lingering animosity between the pair.

Of their relationship failure, the source said: "It's a shame because Taylor is a lovely girl. But it just obviously wasn't meant to be."

This comes shortly after a source claimed the "heartbroken" 26-year-old singer felt she had no choice but to walk away because Calvin wasn't prepared to wed and have children in the foreseeable future.

A source explained: "Taylor ended things as she could feel their relationship wasn't heading in the right direction. She discovered they were on different paths in the last few weeks. It wasn't that they weren't happy, but when she raised the subject of their future it became clear they do not want the same thing at the same time.

"Taylor is heartbroken. But it could have been a lot worse if they were in this position in another 15 months. She always saw herself as a young mum. It's not that she's in a rush to settle down or anything. But she also doesn't want to waste time either."

Calvin was reportedly reluctant to make a "complete commitment" to the blonde beauty.

But the source added: "He absolutely adored their time together, but being a devoted boyfriend is difficult to fit in with being the biggest DJ on the planet. He also loved having his own home in LA and didn't want to move in full time together. He loved his own space."