Robert Pattinson has been dating Riley Keough privately but doesn't call her his girlfriend. Robert was spotted kissing a mystery brunette in Toronto, Canada on July 22. Is Riley okay with this?

Rob, 27, and Riley, 24, have been quietly dating since June, HollywoodLife.com reports. But a source close to the couple said that the "Twilight" actor still considers himself single.

"Rob will probably be seen with other girls along with Riley," the source said. "He generally considers himself both single to his friends and exclusive when he is with Riley. He wants his cake and eat it to kind of thing. It's getting very physical between him and Riley, but he still isn't ready to pull the trigger on a full relationship as he will be away filming soon and he doesn't want to ruin something that is blossoming by leaving. He is aware that something still might happen, but he is being cautious. But with a strongly physical relationship that is happening, he knows that can always lead to more, so his mind is everywhere."

Riley lives in LA, while Rob is working in Canada, filming scenes for the film "Maps To The Stars."

Rob was out for dinner with a few friends from the film when he was spotted locking lips with the mystery woman. Co-stars Mia Wasikowska and her boyfriend Jesse Eisenburg were standing nearby while Rob, dressed in his trademark beanie and a gray T-shirt, gave a peck to the woman.

It is unclear as to whether it was a friendly kiss or a girl he's been seeing in Canada.