Did drug abuse cause Khloe & Lamar's marriage crisis?

Khloe Kardashian has reportedly thrown husband Lamar Odom out of the house due to his alleged drug abuse.

The couple have been subject to persistent rumours that their marriage is in trouble after Lamar, 33, allegedly cheated on Khloe, 29, with two different women.  

But several sources have told TMZ the real reason behind their marriage crisis is that Khloe reportedly believes that her husband has a drug problem.

Representatives for Lamar did not respond to MailOnline's request for comment. 

Earlier this week the Kardashian family allegedly staged an intervention to convince Lamar to return to rehab, but he refused, reports the gossip website. 

Khloe urged Lamar in August 2012 to go to rehab and after he entered a San Diego facility she hired private investigators to make sure he didn't leave.

Packed bags: A man was seen loading large amounts of luggage into Lamar car while the basketball star stood by in Calabasas, California

 Lamar reportedly constantly threatened to leave the rehab clinic and Khloe visited several times to convince him to stay, but he left after three weeks, sources said.

Lamar, who won two championships with the Los Angeles Lakers, stayed clean and played well last season for the Los Angeles Clippers, but sources said he resumed using drugs after the season.

Khloe was convinced of recent reports of Lamar's infidelity, but feels his drug abuse has been the main problem, the website reported.

Neither Khloe nor Lamar has contacted a divorce lawyer

Online affirmation: Khloe posted a tweet on Friday citing the importance of strength to survival

Heartfelt: Lamar posted a tweet last month supporting Khloe as claims of his infidelity surfaced

'Khloe is more concerned about saving Lamar than ending her marriage,' a source told TMZ.

Khloe allegedly tossed Lamar out of the house after the failed intervention, and he was pictured Wednesday as an associated loaded a number of large suitcases into his car in Calabasas, California. 

Khloe and Lamar got married in 2009 about a month after meeting each other.

Khloe has recently endured reports that Lamar had an affair with Jennifer Richardson for a year until March 2013 and a six-week fling with lawyer Polina Polonsky at the start of the summer.