Rob Kardashian is sending his sisters text messages saying he wants to marry Blac Chyna, Hollywood Life reported Wednesday. Kardashian and Chyna’s dating reports came out Monday, shocking the “Keeping Up With The Kardashians” star’s family.

“Rob’s sisters are convinced he is joking, but he is making them upset by sending texts to them saying he wants to marry Blac Chyna and that it will happen soon. Especially since Valentine’s Day is right around the corner. But as much as they think he is kidding, they are also scared that he may be serious and elope in Vegas,” a source told Hollywood Life.

On Tuesday, Kardashian had shared a photo of Chyna on his Instagram account, setting off pregnancy rumors. Moreover, he is staying with Chyna, who previously dated Kylie Jenner’s boyfriend Tyga and has a son with the rapper.

However, another source told Hollywood Life that Chyna was only playing with the 28-year-old Kardashian’s ego. Many in his family also think that 27-year-old Chyna is only getting back at Jenner by dating her step-brother.

“Blac Chyna is totally playing to Rob’s ego, she’s been telling him that he’s better in bed than Tyga. He hasn’t had this much attention from a woman in a long time, she’s got him sprung,” an insider told Hollywood Life. “A lot of people are convinced she’s just playing him and it’s all just about getting back at Kylie, but it definitely is doing Rob good in the short-term.”

Meanwhile, Khloé Kardashian feels betrayed that her younger brother has almost moved in with Chyna. "The drama continues. Rob still has some of his things at Khloé's house. He hasn't arranged to pick it up," a source told People magazine. "Khloé knows that he is living with Blac Chyna. Khloé feels very betrayed. She always stood up for Rob and defended him. She has gone out of her way a million times to help him. She is very frustrated at the lack of respect for his family."