It appears like they will never, ever get back together. Calvin Harris went on a Twitter rage on Wednesday, July 13, accusing his ex-girlfriend Taylor Swift of trying to make him “look bad” after it was revealed that Swift assisted Harris in the writing of his summer hit, “This Is What You Came For.”

Swift composed the lyrics of his song with Rihanna, according to the DJ. Her agent informed PEOPLE that she is credited by the pseudonym Nils Sjoberg.

“And she sings on a little bit of it too. Amazing lyrics writer and she smashed it as usual,” Calvin wrote on Twitter. “I wrote the music, produced the song, arranged it and cut the vocals though. And initially she wanted it kept secret, hence the pseudonym.”

“Hurtful to me at at this point that her and her team would go so far out of their way to try and make ME look bad at this stage though,” Harris said.

He then mentioned Taylor’s relationship with Thor actor Tom Hiddleston, whom she began seeing just days after breaking up with Calvin, and slammed her for seeking to “bury” him, like Katy Perry, her pop adversary.

“I figure if you’re happy in your new relationship, you should focus on that instead of trying to tear down your ex bf for something to do,” he said in a follow-up tweet that received almost 3,000 likes in less than half an hour. “I know you’re off tour and you need someone new to try and bury like Katy [Perry] ETC but I’m not that guy, sorry. I won’t allow it. Please focus on the positive aspects of YOUR life because you’ve earned a great one. God bless everyone have a beautiful day.”

Katy has subsequently reacted to Calvin’s tweet with a sarcastic GIF of Hillary Clinton, the Democratic Party’s presidential nominee in the United States.

She also retweeted this insightful comment from May 2015, writing, “Time, the ultimate truth teller.”

Swift has long been said to feud with Katy Perry, with whom she has a quarrel, and her song “Bad Blood” is said to be about the “Roar” singer. (Neither performer has responded to the claims publicly.)