And see, I get stuck on the thought that there's some editing of history going on there. Because, see, Ianto starts out by saying something about meeting Lisa and never feeling so alive, then he says something like "losing lisa. felt like the world ended." *Then* he brings up the "coming here." But strictly speaking, Lisa died after Ianto started working at Torchwood 3. So unless Ianto is seeing Canary Wharf as the point where he lost Lisa (which is in some ways a valid pov), then there's a bit of shifting around of event order going on within Ianto's internalized personal history. It's like he's editing out the time when Lisa and Torchwood 3, Lisa and Jack overlapped, and remapping it into a more straightforward sequence: Lisa - losing Lisa - coming to TW3/meeting Jack, allowing himself to skip over what was probably the most traumatic period of his life, when he was desperately trying to save Lisa while being wracked with the stress/guilt of deceiving Jack and other TW3 members.

And I'm reading way more into this than the script writer probably intended, aren't I? LOL.