All Creatures Great and Small star Callum Woodhouse, who plays Tristan Farnon in the drama, has cryptically shared a development for his character which could spell trouble for his relationship.
Series six saw Tristan struggling with PTSD after returning from the front line as he tried to settle back into normal life.
He kept quiet about what he was going through until the finale, which saw him break down in his brother Siegfried's (Samuel West) arms.
He detailed how his close friend Billy had died after his screams alerted Tristan to a landmine.
All Creatures Great and Small's Callum Woodhouse hinted about the future of Tristan's relationship
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He told Siegfried: "I got a medal because I managed to save a few chaps, but Billy wasn't one of them.
"He saved me, but I couldn't save him. The Cross should be his, not mine."
Despite his struggle following tragedy, though, there was one thing Tristan had to be hopeful about, his new love interest Charlotte Beauvoir (Gaia Wise).
Speaking previously to Radio Times, Mr Woodhouse explained: "I think she's come into his life at a time when he just really, really needs her."
He explained the characters have "great chemistry" and "get on really well."
However, in a recent interview with the publication, Mr Woodhouse admitted things might go a bit wrong for Tristan in series seven.
"It's not really a massive spoiler to say I'm still with Charlotte Beauvoir, who is really good for him and helps him with his mental health," the actor told Radio Times.
He added: "She keeps him happy and... I think he's a little bit more content. But there's only so long that that can last."
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Callum Woodhouse teased what might be to come for Tristan
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He cryptically went on: "So, things may be coming to change, but we don't know."
However, the actor didn't give away much else regarding Tristan's new relationship, so fans will have to wait until All Creatures Great and Small returns to Channel 5 later this year.
Speaking back in November ahead of the latest Christmas special, All Creatures' leading man Nicholas Ralph, who stars as James Herriot, talked about the "chaos" of filming the show.
He revealed that production for the Christmas 2025 episode took place during the summer, specifically in July, despite its winter setting.
Callum Woodhouse plays Siegfried Farnon's brother, Tristan, in All creatures Great and Small
|CHANNEL 5
The actor explained how the seasonal transformation of Skeldale House affected him during filming, describing the experience as particularly immersive.
Speaking to Radio Times, he added that the festive adornments had a profound effect on him, making him feel "transported" by the remarkable seasonal styling throughout Skeldale House.
"The director, Andy Hay, just let a camera roll while the kids improvised.
"Then we put the animals in, and that just added to the chaos.
"James is on the back foot anyway because he’s said to Helen he'll take over the writing and directing and producing - and when I walked into the room, there was absolute chaos going on, so there was no acting required, really."