Are Erin And Antony Dating?
Erin Moriarty and Antony Starr are not a real-life couples. They worked together in the Amazon Prime Video series The Boys.
Erin played Annie January, and Anthony portrayed Homelander. The series features two groups of superpowered individuals, the Seven (Vought's premier superhero team) and the Boys (vigilantes looking to bring down Vought and its corrupt superheroes).

Homelander leads the Seven, and Annie is one of the members of the team. She is the only one from the Seven with selfless and benevolent motivations, while her leader is an antagonist. He is an egotistical and sadistic narcissist but has a public image as a noble and generous hero.
Fans thought they had a romantic connection, even though they did not have onscreen chemistry. January was in a relationship with Hughie Campbell. They had ups and down in the series, but in the end, the pair ended up marrying and settling down in Hughie's hometown in Scotland.

Per the discussion on Reddit, the actors spent most of their time in Covid together, and they got spotted having lunch quite often. The pair hanging out after work and going on a trip to Costa Rica in December 2021 made their followers question their relationship status.
The duo also went to a Universal Studios theme park with Jack Quaid and Claudia Doumit, making people presume they were on a double date.
Moriarty shared a picture of them on her Instagram with the caption, "On-screen foes/off-screen BFFs." She posted two photos, one of them as co-stars and the other as buddies, on the 4th of June 2022. Starr replied on the post, "Co-captains ;) #starlander," and their admirers promoted the hashtag #homelight.