Rose, 30, took to Twitter to share her personal heartbreak with her followers after splitting from Khalifa.
"The mornings are especially hard. The pain... I wake up every morning feeling like my best friend died... I never knew what a true heartache felt like until now," she tweeted.
Rose's confession came around two weeks after filing for divorce from Khalifa on September 23.
She recently sparked dating rumours with Nick Simmons, son of Gene Simmons, after they were spotted walking hand-in-hand last week. However, they have debunked the rumours, insisting that they are just friends.