Stay Away! Freaked Out Khloe K. Threatens To SLAP Ex Lamar With Restraining Order

Khloe Kardashian may be moving on with her new boyfriend Tristan Thompson, but her ex, Lamar Odom, just can't seem to let go.

Now RadarOnline.com has exclusively learned that the reality star is "fed up" with Odom's relentless barrage of calls and texts and "threatening to slap him with a restraining order."

"It's really gotten out of hand," an insider revealed. "Lamar's so used to leaning on her he can't help it — and he's still clinging to the hope she'll take him back."

However, it's wishful thinking on Odom's part, said the insider.

"That's never going to happen and Khloe's sick and tired of playing nice with him. She told him she's blocking his number and doesn't want him to call so many times, but he just gets her new number or uses someone else's phone."

"It's really stressing her out," noted the insider of the tense situation between Kardashian, 32, and 35-year-old Odom.