It all started when Luke posted a selfie to Instagram and captioned it "2fast4u."
Arzaylea lashed out at the photo causing fans to step in and defend their singer bae.
As you'll remember, it was reported that the pair initially split up 'cos Arzaylea cheated on Luke, but she claims that it was quite the opposite!
"Is that why he was still with me the NIGHT before he went out with another girl? y'all need to realise none of these guys are perfect. I'm over being the one in trouble lmao."
The social media star then dragged the rest of 5 Seconds of Summer into the rant.
During her time with Luke, Arzaylea spent A LOT of time with his bandmates.
She accompanied them on tours, went out with the guys and even sat in on interviews.
"The racism, judgment, and homophobia that happens in that group. It's disgusting."
"The cheating on me. The lies. Everything that led up to me leaving YOU. IM TIRED OF EVERYONE THINKING THIS IS FOR ATTENTION BECAUSE IVE BEEN HOLDING IN MY PAIN FOR A YEAR. I MADE A MISTAKE BUT HE MADE A BILLION."
Okay, so it looks like this is her admitting that she cheated, but it sounds like there's a lot he did as well.
The 5SOS camp have yet to respond to Arzaylea's rant but we're high-key hoping that they do soon.
Those are some serious, SERIOUS claims and we need them cleared up ASAP.