Chris decides to end his relationship in an upcoming storyline, feeling frustrated as Aidan (Bob Morley) is no longer being honest with him.
Viewers in the UK will soon see Aidan face a worrying setback when he is suspended by the Erinsborough Hospital, but he leaves Chris out in the cold by failing to confide in him about how he's really feeling.
Mason told TV Week: "What it came down to was Chris felt Aidan was becoming too independent - to the point where he wouldn't let Chris in or share anything with him. He found himself constantly shut out.
"Chris is reluctant to end the relationship, but feels Aidan won't change. He even seeks advice from Kyle about what to do."
Although Aidan begs for another chance, Chris stands firm by insisting that their romance is over.
Asked whether there is any hope for the pair, Mason replied: "This is the second time the two have split up. It might be time for Chris to move on."
Neighbours airs these scenes next week on Eleven in Australia and in February on Channel 5 in the UK.