Jim Carrey's Girlfriend Attempted Suicide Once Before

Jim Carrey's on-and-off again girlfriend Cathriona White tried ending her life in 2012 and we're told a hateful message from her biological mother may have led to her suicide ... law enforcement sources tell TMZ.

Our sources tell us, during their investigation they learned White attempted suicide after her father's death in 2012.

We're told White's friends told investigators on Cathriona's birthday -- just days before her suicide -- she received a hateful message from her estranged biological mother who called her a "failure."

Cathriona committed suicide on the 3rd anniversary of her father's death.

Our sources say her mother's attack, along with the somber anniversary and her breather with Jim, may have contributed to Cathriona's suicide. It appears she OD'd on drugs.