The hunky star found it difficult to leave mobster character JOEY GAZELLE on the set while shooting new action thriller RUNNING SCARED - and his creation almost cost him his romance.
He tells style magazine Complex, "I was so into it I was impossible to be around.
"This girlfriend of mine came to visit. She was supposed to stay for two weeks, but she left after three days. She said, 'I have to leave because you scare me.'"
With his girlfriend gone, Walker attacked the character full-on and really became Gazelle.
He adds, "I was beat at the end of the day. I was angry and p**sed off, but I felt so good. I would wake up after six hours of sleep, just ramped. I'd get in there and I couldn't wait to become that monster."