The 19-year-old Famous in Love star stopped by SiriusXM's The Jenny McCarthy Show on Monday, where she discussed how "difficult" her breakup with the Teen Wolf actor was, and cleared up what happened between her and Puth.
"Honestly, Ty and I stopped dating and that was really difficult for me. It was definitely one of the hardest breakups I've been through," Thorne told McCarthy. "Basically, Ty and I stopped dating and Charlie had been tweeting about me for a while. He was trying to reach out to me."
"I hung out with him twice. We went to the movies. He was cool," she continued. "I was like, 'Wow, you're really talented. Holy sh*t. You're f*cking great, dude.' And then he invited me to Jingle Ball to watch him perform."
Thorne added that she had never flown to see anybody and was really excited about watching Puth "behind the stage," but after they hung out, "everything got blown way out of proportion."
A picture of the two on the beach in Miami, where it seemed like they were about to kiss, surfaced online before news of Thorne and Posey's breakup went public, and that's when the cheating rumors began.
"We weren't even kissing in that photo," Thorne clarified. "Like, that photo makes it look like we are about to kiss, and we are straight up not about to kiss. So, I was a little butt hurt in that sense, that it got out like that."
The former Disney star then texted Posey to make sure that everything was good between them, adding that when she returned home, they hung out but she never heard back from Puth.
"Charlie saw an old news article, and he didn't look at the date, and the date is old, and it's about me and Ty," she continued. "In Charlie's defense, when he read it, not reading the date, it sounded like it was about me and Ty still being together. He didn't even text me or talk to me about it."
Instead, Puth took to social media to tweet about how Posey "shouldn't be treated this way" and "she told me she was not with him anymore."
Thorne replied to the tweets, writing, "Ty and I have been broken up for like over two weeks and Charlie and I ARENT DATING we are friends. That article was written forever ago."
"I felt super bad," Thorne told McCarthy during the interview. "I kept calling him. He wouldn't answer my calls, and then he just starts texting me." She added that Puth "should have just called me" to set the record straight.
Last month, the actress and singer echoed the same sentiments about her relationship with the Keeping Up With the Kardashians star by telling ET that they were "chillin', we're friends." See more of her comments in the video below.