 Miller began dating actor Jake Gyllenhaal in mid @-@ June 2013 and they became a public couple in July . Their first public appearance as a couple was at Barry 's Bootcamp , a gym in Tribeca , on July 12 and she met Gyllenhaal 's mother three days later . She credits Gyllenhaal with teaching her how to cook as they hosted dinner parties . According to reports , Miller and Gyllenhaal broke up in late 2013 . A source told <unk> : " They fizzled out . It happened a while ago – before the holidays . He 's back on the scene . " However , by February , the couple had reconciled . In May 2014 , they were spotted together walking her dog , a Boston Terrier named Charlie . 
