The couple reportedly was out and about together in Los Angeles less than a month ago, but Dawson pulled the plug.
"She broke up with him," a source said. "She was the one who ended it."
The source said Dawson and Schreyer, a French DJ by trade, were "always in separate places because of their careers" during their romance that began in 2008.
Boston schools pull out free condoms over wrapping complaints
Millions of Getty images now available for free via embed tool