Jai Sharma and Rachel Breckle's one-night stand comes a day after a heated argument between Jai and his new wife Charity.
Revealing the source of the couple's troubles, the actor told Soaplife: "He's devastated because Charity won't have his baby. Not having children is a huge sacrifice for Jai, possibly the biggest he could make."
Bisson said that viewers will see a "completely selfish" side of Charity when she makes little of Noah's new passport, which has been updated with Jai's surname following the youngster's adoption.
"They're not on the best of terms when the passport arrives and Charity just tosses it aside," Bisson added. "She doesn't even give Jai the satisfaction of seeing the name change. She's being completely selfish. She doesn't realise how much that actually hurts him."
However, the star hinted at a more stable future for the couple, adding: "I think if he had known before that she didn't want a baby, he maybe would have thought harder about marrying her. But he does love her and they do have Noah together - they are a family."
> Emmerdale's Gemma Oaten shocked by Rachel, Jai one-night stand
> Emmerdale's Chris Bisson confirms: 'No affair for Jai, Rachel'