Coronation Street spoilers follow.
Daniel Brocklebank has revealed Billy's guilt in emotional Summer scenes in Coronation Street.
Upcoming scenes will see Billy deliver a letter from Summer's father on her 18th birthday, leaving her conflicted over whether she's ready for such a big step.
Billy and Summer's boyfriend Aaron have also gone against her wishes by checking with the hospital over whether she will qualify for a glucose monitor.
Ahead of these scenes, Daniel Brocklebank admitted that Billy doesn't give enough thought to Summer's feelings before presenting her with the letter.
"He doesn't really think about it too deeply and he feels guilty about that afterwards," the actor said. "I think he's more excited, thinking that it's going to be a really beautiful moment and a lovely gesture.
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"He's not quite prepared for how upset she becomes because of it, he could maybe have thought that through a bit better but the thought was there."
A divide between Billy and Summer will grow when she realises her boyfriend and her adopted parent have been talking behind her back, especially since she's been actively cheating on her blood tests.
"Well, of course, he doesn't know that she's still mucking about with her levels so he can't quite understand why she doesn't want this monitor, because of course, to him, it just makes sense to have something that can totally alert you to any possible problems," the actor explained.
"She's had to cancel her holiday because of messing about with her insulin but because Billy doesn't know any of these details he's not seeing the picture. So when Aaron brings it up with him, because Aaron is aware of what she's doing, it highlights how unaware he is of how little she is continuing to take care of herself."
He went on: "When you take on a child, you know that at some point they're going to be a teenager and teenagers are notoriously difficult, I was one once myself. I think he's prepared but obviously, they've had extra stuff to deal with that most people with teenagers don't.
"It's not just about the partying and the going out, Summer isn't really that kind of kid, so he's never really had to deal with that, mainly it's been University worries and the diabetes. However, he is unaware to the extent of which she is not taking care of himself."
Summer and Billy's relationship is facing more changes as she gets ready for university and embarks on her first serious romantic relationship.
"I mean, you've got to be mentally prepared for the fact that obviously she's growing up and there are going to be changes," Brocklebank said. "I'd love to see Billy and her having the chat because I think there could be some real comedy in Billy squirming his way around talking about the birds and the bees.
"All in all she's a pretty good kid, I think he actually just doesn't know half the stuff she's contending with but that's got to come to a head at some point."
Brocklebank also spoke about the ways his working relationship with Harriet Bibby has evolved as she's grown up.
"Harriet is adorable and incredibly professional, she’s a joy," she said. "She’s a dream to work with and what I’m really enjoying is seeing Summer develop as an adult, because the character was only 11 when she joined the show.
"It's been lovely to see Harriet being given the opportunity to actually get her teeth into something that is purely and simply her story. It's been really lovely to see Harriet shine, she’s brilliant and she should be very proud of herself."
Coronation Street airs on Mondays, Wednesdays and Fridays at 8pm on ITV and streams on the ITV Hub.
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