Wyck Godfrey insists the personal life of the couple - who have been rumoured to be dating since starring in the first movie in the franchise - doesn`t affect the movie series, though he occasionally worries about what would happen if they ended their relationship.
He told Time magazine: "I honestly don`t think of it in terms of business. It doesn`t affect our core business at all.
"The thing I do think about is, `Oh my God, I hope they staytogether`. Because it could be awkward on set in the next movie if they have a huge falling out.
"It`s like, -Wow, they have to portray this love story through two more movies. God, I hope they staytogether, please staytogether`. That`s what affects my day-to-day."
Wyck also admitted he feels attention on the couple - who have always refused to confirm their relationship - is starting to fade because they have such a "stable" romance.
He added: "Do people still report on it? If you look at people who have a stable personal life, people get tired of them.
"I think we`re heading to that place where they are together and that`s their life and we better find someone new to create drama out of."