The Girls Aloud singer was thrown into a rage and decided to end the relationship after seeing pictures, the Daily Mirror reports.
"I'm not the kind of girl to put up with nonsense like that. I'll meet the right person when the time is right. I'm disappointed but what can you do," she told the paper. Scroll down for more...
Metcalfe was caught affectionately cuddling a brunette in LA while Coyle was back home in the UK.
Our source who spotted the Desperate Housewives hunk said: "They were walking, hands locked together. There was no kissing though."
21-year-old Nadine dated Jesse for over a year and there were even rumours of an impending engagement.
Last month Jesse admitted he was battling alcohol problems and checked himself into rehab.
Nadine had vowed to stand by her man through the ordeal, but this latest incident was too much to handle.
The star has been busy filming the new St Trinian's movie in Henley-on-Thames, Oxon.
Jesse Metcalfe with girlfriend Nadine Coyle
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