The 26-year-old actor has moved out of the Los Angeles home he shared with Kristen Stewart following her admission she cheated on him with married director Rupert Sanders.
He has reportedly left friends worried by sharing his woes with fellow guests at the hotel where he is temporarily staying, reported Sun online.
"Robert has resorted to asking strangers out to keep him company. He went out for drinks with a woman staying in his hotel and he told her it was 'ridiculous' he had nobody to talk to," a source said.
Pattinson has also been spending a lot of time alone trying to forget his relationship difficulties.
"He's been spending most of his days off just playing computer games," the source added.