Bruce, who split from Khloe's mother Kris Jenner after 22 years of marriage toward the end of 2013, spent over an hour on the phone to her estranged husband on New Year's Day to keep him in a positive frame of mind, reported Hollywoodlife.
"He told Lamar to forget about everything that happened in 2013 and not drag all the drama, defeats and embarrassments with him," a source said.
"Bruce told him, 'It will eat you alive and ruin any progress if you stay in the past.' He also told Lamar to stay off the websites and turn the TV off and not listen to gossip about him. He basically gave Lamar a lot of advice and mental support," the source added.
He is now said to be worried about the way he will be portrayed in the forthcoming series of reality show 'Keeping up with the Kardashians', which centres around Khloe and her sisters Kourtney and Kim.
Bruce reportedly told him to 'hope for the best but expect the worst when it comes to that show and what they're going to reveal because this is how they survive - by putting everything on the table'.