Swift has literally made a career out of her many failed relationships; they're notoriously short-lived and reportedly act as inspiration for her hit songs.

However, things seemed different when she started dating Calvin Harris in 2015. The relationship lasted well past her average few months, so fans were shocked when the couple called it quits in June of 2016. At first, the breakup seemed amicable. "The only truth here is that a relationship came to an end & what remains is a huge amount of love and respect," Harris wrote in a since-deleted tweet, per TMZ.

Sadly, things soon took a turn for the worst after news broke that Swift had, uh, swiftly began dating actor Tom Hiddleston and had also secretly written Harris' hit song with Rihanna, "This Is What You Came For." The one-two media punch did not sit well with Harris, who quickly slammed Swift in a now-deleted Twitter rant. "I figure if you're happy in your new relationship you should focus on that instead of trying to tear your ex bf down," he wrote. Ouch.

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