MUMBAI: Scottish DJ Calvin Harris reportedly "struggled" with his former girlfriend Taylor Swift's "regimented" life and the pressure of dating one of the world's biggest pop stars.

Harris recently called time on his 15-month romance with Swift and insiders admit the ‘Summer’ hitmaker struggled with the relationship, reports femalefirst.co.uk.

"Taylor is an empire in her own right and, as such, her life is very controlled," a source told Britain's Grazia magazine.

"At the end of the day, Calvin is still a small town boy from Dumfries (Scotland) and I think he struggled with living in such regimented conditions where his every move was speculated on," the insider added.

Harris, who cancelled a number of shows last month after being involved in a car accident, was said to feel increasingly "suffocated" by Swift's attention, while she often felt "pushed away" by him.

"There were a few times when Taylor wanted Calvin's support and he bailed but she would dismiss her doubts and tell herself it was because he was always so career-focussed," the source said.

"Then, after his crash, she dropped everything to be with him and was ready to prove her commitment," added the insider.

(Source: IANS)