Lea, who plays Rachel told Cleo, "From what I can make out, they're going to be together for a while, which I didn't think they would.
"They have a very serious love right now.
"I'm interested to see what Rachel is like as a girlfriend and if they're going, you know, to go all the way!
"I'm worried about her. I want to know what's going to happen.
"She's 16 and it's a little young, but we'll have to see."
Lea, 24, also said her own real-life romance with Broadway star Theo Stockman was difficult because she is now based in Los Angeles, on the opposite side of America to where he works.
"Being so far away from each other isn't great, but we put in the effort to make time for one another."