Lindsay Lohan's “pathetic,� rehab romance!

Lindsay’s rehab romance was “pathetic,� a source tells Star.

“He was a married guy from the Midwest with a nice body. He was having fun with Lindsay. She called him her ‘rehab boyfriend.’ They would fool around all the time. And they weren’t just kissing. He was in her room often.�

But when the time came for her “boyfriend� to leave Promises and fly home, Lindsay was a wreck.

“She completely freaked out,� the source says. “She started screaming, ‘Don’t leave me! Don’t leave me! If you leave I am going to die!’� A few minutes after he left, Lindsay emerged from her room with blood dripping from a self-inflicted wound on her wrist. “She cut her left wrist so badly, there was blood everywhere – on her clothes, on her face, in her hair,� the source reveals. “She was screaming, ‘He can’t go’ and sobbing.�