The actress, 38, is said to have broken things off with Ernesto, 34, because of their hectic timetables and geographical distance – Eva spends most of her time in Los Angeles while Ernesto is based in Miami.
Despite her relationship troubles, Eva put on a brave face when she attended the Not Included event at the Chinese Theatre in Hollywood on Thursday night.
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The star looked chic in a white shirt and denim jeans and happily beamed at the cameras.
The pair met when Eva was producing reality dating show Ready for Love, on which he featured as one of the bachelors. His relationship with the winner of the show fizzled out and then he began dating Eva.
The couple were spotted holding hands as they holidayed together in Europe last month, just a week after going public with their relationship.
They are also said to have visited Nicaragua before announcing their romance, where Eva was introduced to Ernesto's family for the first time.
"My guess would be they'll be married within the next year," a source told People magazine at the time.
"It's very real – they're both in love, which is rare for him. They're always travelling together.
"Eva is a firm believer in marriage. Ernie may be a player when he is single, but he's never cheated on anyone and is very religious. I think the fact that he's so family oriented is what got her."
Eva recently denied claims that George Clooney asked her out while he was still in a relationship with Stacy Kiebler.
Us Weekly previously reported that George had unsuccesfully shown an interest in the Desperate Housewives actress, a claim that Eva took to Twitter to deny on Thursday.
"As interesting as the George Clooney rumors are, they aren't true," tweeted Eva, 38. "George and I have been friends for years."
Eva set the record straight after a source suggested that George, 52, had tried to pursue a romance with her despite his two year relationship with Stacy.
"He told her that he was still with Stacy," said the source. "But had plans to break up with her and was interested in being with Eva."