Xmas holiday dilemma

Should I say something?...
Every year we meet up for a ski-ing holiday with a dozen friends. I'm hosting this year's - and it's a bit awkward, as my best friend- we'll call her: "A" and hubby's best friend: "B" split 2 years ago, and though they are both going with new partners. I know B is still burning a torch for my bestie, and she's not quite over him either, but my hubby says she'll keep her distance, and anyway B's met someone special now, and when B talks of A it's - "She's got an icy soul" and "she tore him apart, never again!" But last year's meet-up was a nightmare. He was all brooding glances at her when we were setting up the decs, and she had worn a piece of past jewelry he'd given her, and kept drawing attention to it all night, giving him longing looks, and him her - then with them both having jealous glances whipping back and forth between them as we prepared the decs, and over the xmas dinner. We all could not help but notice!
I was wondering if it might be a good idea to have a word with one or both of them before going?