Stormborn saw Yara Greyjoy (played by Gemma Whelan) introducing Theon (Alfie Allen) as her "protector", but it became clear that the former ward of House Stark still hadn't left his coward days behind after the abuse he suffered from psychopath Ramsay Bolton (Iwan Rheon).
Forced with a choice to either run away from their evil uncle Euron Greyjoy (Pilou Asbaek) – who had descended on their ship with his army and held Yara hostage – or save his sister, Theon chose to jump overboard and leave everyone behind.
Speaking to The Hollywood Reporter, Whelan explained that she has already forgiven him, saying: "I think she understands that he probably couldn't have done anything at this point. Euron is so powerful. He has me.
"If Theon takes even one step forward, Euron can kill me. I'm not currency to him. I think she probably understands he has no choice. But I also think she's very upset that he's having flashbacks, and she understands there's a lot going on for him."
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Ultimately, I think she's devastated
The actress went on to reason that she thinks Yara's love for her brother is stronger than the feeling of betrayal, saying: "I don't think she feels like he's abandoning her. I think she feels like he's having a terribly traumatic time, there's nothing he can do, and maybe — just maybe — he's jumping ship now so he can come back and do some good.
"Ultimately, I think she's devastated," she added.
The star also teased how her normally tough character will struggle to cope being at the mercy of her unhinged uncle, but she will try her best to stay strong.
"She's completely helpless now, and so is Theon. She's in the hands of her psychopath of an uncle, and she has no idea what's going to happen next. She's very fearful, but doesn't want to show that she's defeated," she revealed.
Game of Thrones series 7: First Look
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Actress Jessica Henwick, who played Nymeria Sand in the HBO fantasy epic, also spoke about her departure from the series on Friday, after the Sand Snake's brutal death at the hands of the pirate.
“I feel like I’m mourning the character. I played her for three seasons which is about four years in real time. It was such an honour to be part of such a big show. I think I’m in shock," she said.
Game of Thrones continues on HBO this Sunday in the US and will be simulcast on Sky Atlantic on Monday at 2am. Catch up on seasons one to seven on NOW TV.