Lea Michele stands by boyfriend Cory Monteith after he checks into rehab

Glee actress Lea Michele has vowed to stand by her man Cory Monteith after he checked himself into rehab for substance addiction.

Cory – who also starred in US show Glee – has struggled with substance abuse in the past, and has now decided to enter a treatment facility over the weekend.

“Cory has voluntarily admitted himself to a treatment facility for substance addiction,” his spokesperson told People.

“He graciously asks for your respect and privacy as he takes the necessary steps towards recovery.”

Lea told the publication: “I love and support Cory and will stand by him through this. I am grateful and proud he made this decision.”

Glee is currently in production filming season four and Cory is expected to miss the final two episodes.

A spokesperson for Glee said in a statement: “Cory is a beloved member of the Glee family and we fully support his decision to seek treatment.

“Everyone at the show wishes him well and looks forward to his return.”

Cory has been open about his addiction problems in the past, and revealed back in 2011 that he entered rehab aged 19.

The 30-year-old hoped that talking about his own issues would help others to avoid making the same mistakes he did.