Khloe Kardashian and Lamar Odom's marriage is in crisis, with new reports that their relationship began to face problems due to the basketball player's alleged drug use.

Multiple sources familiar with the situation told TMZ that Lamar has been using drugs for over two years.

Last August, Khloe reportedly pressured Lamar to go to rehab. He went to a facility in San Diego, but he was so resistant Khloe hired private investigators to secretly stand guard at the rehab place to make sure he didn't leave.

According to TMZ's sources, Lamar constantly threatened to leave and has officially moved out.

As for reports that Lamar was cheating recently, Khloe is convinced it happened. (Neither Khloe nor Lamar has contacted a lawyer to file for divorce.)

Two weeks ago, attorney Polina Polonsky said she had a six-week affair with Odom. She claimed she met the Khloe & Lamar star the same night as Kim Kardashian's baby shower. Radar Online published excerpts from Polinsky's interview.

Lamar Odom's Alleged Mistress Jennifer Richardson Reveals Their Affair

Another woman, Jennifer Richardson claimed she had a yearlong affair with Odom. She spoke out about their tryst on camera. Richardson explained in a video interview -- filmed exclusively by Star magazine -- that she agreed to have a threesome with Odom.

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Khloe Kardashian, Lamar Odom