The 50-year-old told how his character is prepared to “do anything” to protect Michelle (played by Kym Marsh) following the recent attacks.
Robert's dark past has previously seen blackmail threats from violent drug dealer Rich (Fraser Ayres), but now Michelle's life may be in danger as they take aim at her to get back at Robert.
Tristan said: “Robert feels totally responsible for the nightmare that’s unfolding.
“And being the hands-on guy that he is, he decides he has to fix it his way… and it sort of spirals out of control because of that.”
Coronation Street spoiler: Robert thrown into DANGER to protect Michelle's life
Robert goes into protection mode and he gets it fixed without telling her
He continued to Soaplife that Robert believes Rich is responsible for the attacks on the Bistro.
He explained: “Yes, but Rich has a strong alibi. Robert, though, is convinced Rich is responsible and he can’t get this out of his head.
“Robert notices Chesney [Sam Aston] jump when a plate smashes and he worries Chesney may have psychological scars after the Bistro attack. Adam Barlow’s threatening legal action on Chesney’s behalf, but Robert offers Chesney a pay-off he can’t afford to try to avoid more trouble.”
As Michelle has offered to bail Robert out financially, Tristan added: “Robert’s independent and he wants to sort out his own problems and he doesn’t want money to get in the way of their relationship. So he goes to the casino. He thinks it helps him unwind, plus he could win some money.
Coronation Street's most dramatic moments
Fri, June 2, 2017
Coronation Street's most dramatic moments.
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“Michelle is furious when she finds out and they have a big argument. Robert says he got them into this mess and he’ll get them out of it, but this doesn’t hold water.
"Michelle points out this will count for nothing if the Bistro goes bankrupt because he loses more money. There are some icy moments between them and Michelle insists that from now on they tell each other the truth about everything.
“Michelle clearly doesn’t know about it, so Robert goes into protection mode and he gets it fixed without telling her. When she finds out, they fall out again. These attacks are starting to unravel Michelle and Robert’s relationship. Robert will do anything to protect her… We will see just how far he’s prepared to go. This turns out to be quite a significant departure for him.”