He purses his lips. Even with the drugs in the air here, thinking about Ianto's murder still makes him tense.
"Not many, but all you need is one. And one murdered my boyfriend. Another started attacking people but we managed to resoul him before he actually killed anyone."
And Jack's now in a three-way relationship with him, but that's not the sort of thing he's going to come out with to a teenager he's just met, not even here!