Although Lamar Odom's allegations of drug abuse and infidelity tore them apart, Khloé Kardashian and her estranged husband seem like they cannot let go of each other.

The "KUWTK" star took to her Instagram account on Sunday, June 29, to share a cryptic love message. She was seemingly calling out to the troubled NBA player, trying to tell him that she still loves him. The quote was about loving with one's whole heart -- "never touch anything with half of your heart."

Kardashian's post follows her recent 30th birthday, which she celebrated with her new flame French Montana, along with her family and friends. Also, the couple showed off their PDA at her yacht party in New York City on June 28.

Odom reportedly reached out to the reality star to wish her a happy birthday. "He made contact with Khloé on her birthday, but said it was real, real brief. He just wanted to tell her happy birthday and wish her well on this new decade in her life," a source revealed to Hollywood Life. "He even told her he loves her and she said, 'Thank you,' but she didn't say, 'I love you' back. He was slightly hurt by that but he understood."

"He just wants to be on her radar, whether it's good or bad, he just wants to be on her mind as crazy as that sounds. She was nice," the source continued.

In addition, Lamar Odom, who clearly was not invited to Khloé Kardashian's birthday bash, is apparently jealous of her new relationship with the "I Ain't Worried About Nothin" rapper. "While he wants nothing but for Khloé to be happy, he's jealous he wasn't there for her," another source said. "He hates the fact that she's with another man. He hasn't really come to grips that she's in what seems to be a real and committed relationship."

"It would be one thing if she and Montana were casually dating but this sh*t is for real and he's kinda pissed," the source added. "Guess that's life."