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We assumed that Kanye West's proposal to Kim Kardashian was an incredibly happy event for everyone involved. But apparently, it was tough on one person in particular. 

Life & Style is reporting that it has been a bit difficult for Khloe Kardashian to fully delight over Kim's engagement, given her own marital turmoil with husband Lamar Odom.

“Khloe is heartbroken about her failing marriage,” a source says. ”It’s hard to deal with the fact that she thought she had it all, and now everything is falling apart. She is very emotional right now.”

Publicly, Khloe has been gushing about how excited she is for Kim and Kanye. But apparently, Kim's happiness is only serve to remind Khloe of how blissful things used to be for Lamar and her.

"The proposal was very hard for Khloe to see, and she was very open about that," the insider adds. "She said it reminded her of how romantic Lamar was in the early days of their relationship. He really did sweep her off her feet, and the proposal showed how far behind her those days are now."

If this report is indeed true, it's quite sad. We continue to wish Khloe and Lamar all the best, but there's no denying that they've endured their share of problems of late.

Source: Life & Style via Hollywood Life