Antonio Banderas & Melanie Griffith "Have Had Issues For Years"

Melanie Griffith and Antonio Banderas attend the Children's Hospital Los Angeles Gala: Noche de Ninos
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Melanie Griffith and Antonio Banderas's separation may have shocked the world, but friends of the pair say the divorce is no surprise. 

Griffith, 56, filed for divorce from Banderas, 53, on Friday, after 18 years of marriage. The pair met on the set of Two Much in 1995and had one daughter together, 17-year-old Stella

A source told People that the marriage had its problems for years. "The split is not something new and out of the blue," they said. "The flights and separations got to be too much."

However, Griffith gave no indication that the marriage was in trouble. On Thursday night, she hit the town with friend Eva Longoria, and was all-smiles at an event honoring screen icon Jane Fonda. Wearing her wedding ring, the actress posed for pictures and told friends that she was 'good.' The next morning, she filed for divorce.

The pair have weathered many storms in the past, including Griffith's struggles with alcohol and the turmoils of a long-distance relationship. A source told People that Banderas' globe-trotting career finally took its toll on the marriage. "He has always led an international life, and during the times they were apart for business or film work, he began to live his own life away from her."

"It's very sad," the source said. "They had a solid relationship for so many years."

We wish both Antonio & Melanie the best of luck!