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The 25-year-old made the announcement on her Twitter page with a post saying, "A few weeks ago Jason and I broke up. We are great friends and decided we are better this way. I`m in NYC working and I love all your support."
Coyle got engaged to the 33-year-old NFL footballer after a surprise proposal last September.
She then revealed the happy news shortly afterward in an interview with Radio 1 as she promoted her solo album, which failed to take off.
She started dating Jason in 2008 after moving to Los Angeles in a bid to launch her career in the US.
Before Jason, she dated Desperate Housewives actor Jesse Metcalfe and soccer player Neil McCafferty.
Her debut solo album `Insatiable` failed to set the charts on fire after it was released on Tesco`s label.