It's the Big Brother eye, surely? His way of saying that he wasn't going to do anything embarrassing because millions would be watching.
I don't watch Eastenders so I didn't know anything about Ricky but I understand he has he his troubles, behaved badly in the past & paid dearly for it. Like Darren Day when he got angry & upset when he thought that someone had suggested that he had fallen off the wagon, Ricky would be extra careful not to do anything to give anyone any leeway to suggest that he is not now a clean, sober and reliable person for future employment.