He lights up while Jack talks, takes a drag and listens carefully and although none of this has all that much to do with him, he has to admit that it's a relief to hear they're working things out. There's been too much ridiculous drama already, will probably be even more in the future. No point in adding more to it.
He nods, taps ash onto the floor, takes a moment to consider the question.
"Like I said, I'm not one for sharing. I went along with this because it was the only option that wasn't complete shite."
Not off to a great start and honestly he's not sure where all this is going to land. There's no great romance between them, just shagging and yes that's been brewing since long before he even knew Ianto but does that really measure up? Is it necessary or will it just muddy the waters from now on?
"It's been fun, you and me, don't get me wrong. But if you're going to go out and dally, I'm not so sure I want to be part of it."
Strangely enough, this is where the jealousy comes in. He's not one to share but it was fine with Ianto, they had an agreement. Jack, fucking every Tom, Dick and Harry? That would make him feel cheated on and that's not a feeling he's all that keen to have again. Drusilla was enough.