Blac Chyna claimed her ex Tyga isn’t all that thrilled about her engagement to Rob Kardashian, even though he tweeted his support shortly after the news of it broke. The model, 27, contended that the “Rack City” rapper is attempting to ruin her life and destroy her reputation.

According to TMZ, sources associated with Chyna, born Angela Renée White, believe Tyga, born Micheal Ray Stevenson, is trying to damage her relationship with their son, King Cairo. The outlet reported Tyga, who’s dating Kardashian’s half sister Kylie Jenner, filed for custody of the 6-year-old boy.

Sources said Tyga won’t talk to Chyna and changed his phone number so she can’t contact him. The only form of communication the former couple has is through email and their child’s nanny. In addition to Tyga reportedly going radio silent on Chyna, TMZ said the rapper and his friends have been bad-mouthing her, calling the model a “deadbeat mama” and a “drunk w----.”

Tyga hasn’t responded to the report, but he did post on Twitter Tuesday that he was happy for his ex. “Everybody deserves to be happy. What someone does for their happiness is not my concern, as long as it’s not interfering with my happiness,” he wrote. “It makes me happy to see the mother of my son happy. My only concern in this situation is my son. I want him in happy environments.”

Tyga continued: “He’s innocent in this. & I want him to feel as much love as possible. Only an evil heart would direct negativity at a child & make fun of him for being in a situation that is out of his control.”

According to a previous report by TMZ, Kardashian’s family had no idea he was going to propose to Chyna and he waited until its members were out of town before he popped the question. Chyna, who ended her engagement to Tyga in 2014, confirmed Kardashian had proposed to her by posting on Instagram a photograph of her enormous diamond ring. “Yes!...!...!” she captioned the photo. Chyna later shared a video of her sparkly new ring, writing, “I’m so blessed and honored to have a good man in my life, I love you @robkardashian!”