The 25-year-old singer dropped Fine Line on Friday.
One of the songs, "Cherry," quickly garnered a lot of attention. While Styles didn't name any names in the tune, many fans assumed the track was a nod to his relationship with Camille Rowe, whom he split from in 2018 after a year of dating.
In the song, Styles sang about watching someone move on after a breakup.
"Don't you call him 'baby'/We're not talking lately/Don't you call him what you used to call me," he crooned.
At one point in the song, Styles sang, "There's a piece of you in how I dress." He also later revealed, "I just miss your accent and your friends."
Near the end of the track, the former One Direction member played a voice message from someone speaking in French—fueling the speculation the song was a reference to the model.
"S--t, Camille's voicemail in 'Cherry' made me tear up," one fan tweeted. "I'm in my feels. Thanks Harry. "
"'Cherry' made me realize just how much Harry may have fallen for Camille," another added.
During a recent interview with Zane Lowe, Styles confirmed the vocals at the end were provided by an "ex-girlfriend."
"It got added in later on, and it felt so part of the song," he said at the time. "It just felt like it needed it. We're friends and stuff, so I asked her if it was OK. And she was OK with it."
When asked what she thought of the song, Styles replied, "I think she liked it."