Just speculating. I wonder if Carrie's boyfriend will turn out to be part of the plot against her and it was a set up to get her to fall for him, for reasons we don't know yet? It all seems a bit pat that he resembles Brodie so much, and he seems a bit too 'perfect' also.
I don't think something like that is random in a show like this. Or it could just be to let us know that Carrie still thinks of Brodie, and the storyline was allowing her a short spell of happy normality. More likely to be trouble.
I'm enjoying this series and happy to be taken along the new scenarios. It had to move on from the first series, and having it set in different countries is a clever way of keeping it all fresh.