The pair are about to go through some trying times in next week's episodes of the ITV soap, which will see Aaron's (played by Danny Miller) ex-prison mate and terroriser Jason (Samuel Edwards-Cook) show up with Ethan (Michael Warrender) in a harrowing storyline for the character.
In an interview with Radio Times, Miller revealed he's not sure if there will be a future for the couple.
"In some senses, they're bad for each other," Miller began. "If Robert had had a one night stand it would have been so much easier. But it's the fact that it's Rebecca who he chose to confide in and have sex with.
"As Danny, I'd say walk away, but I'm sure the fans won't want to hear that!"
Emmerdale: Actor Danny Miller has revealed he wants his character to split up with Rob
Emmerdale: Ex-con Jason will terrorise Aaron in his home
Emmerdale: Aaron and Rob are headed for a very rocky patch in the series
As Danny, I'd say walk away, but I'm sure the fans won't want to hear that!
The catalyst for Aaron's downward-spiral is the news that Rebecca is expecting his baby after their latest night spent together, and he will subsequently turn back to drugs and self-harm following an appointment at the doctor's surgery.
Miller revealed that when Aaron asks Ethan for drugs, however, there will be a shocking twist.
"Yes, in typical soap fashion, there's a twist and Ethan ends up bringing Jason with him. He's the one who punched Aaron all around the prison and got him addicted to Spice in the first place.
"Jason sees this as an opportunity to further his intimidation of Aaron. Is Aaron going to get battered in his own home? It's a scary situation."
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Claire King as Kim Tate in Emmerdale and now in Coronation Street as Erica
Emmerdale: Aaron can be seen lying flat on his face after a fight with Jason
The 26-year-old discussed his troubled character's choices, and fans should be aware that there will be potentially distressing scenes on the soap.
"Aaron doesn't want to live that criminal life, so he gets rid of the Spice and goes back to self-harming because he thinks it's a better way of dealing with the situation.
"It's more secretive and it keeps his self loathing from people. It's desperately sad, but it's Aaron's way of dealing with it. It's a release for him. And he doesn't want to go back to the drugs world."
Sadly, Miller doesn't appear to have much faith in the couple, as he added: "There's so much for them to overcome. Viewers will certainly be asking themselves, 'Is this the end of Robron?'"