It does matter though, that is why Harry was not protected when he was with Luccio. He Loved her but she did not.
I would have said that he cared about her, but didn't love her. I don't remember him even thinking he might. That's around the same time as he realized Karrin had some deeper feelings for Kincaid besides horny, so he was on the rebound, IMO. Actually the whole Kincaid situationship is a big "tell me you like Harry Dresden without telling me you like Harry Dresden" moment for Karrin and the same can be said about Luccio, she was basically Wizard Murphy.
But I do agree that the lore so far is not exactly that true love is ilogical, what it is is a mutual communion, a mutual coming together in mind, soul, body, but it is mutual. But sure, once it has settled can be disturbed, not the love itself, but the mark it left, by the action of just one individual. Now, before 12M, the disturbance had to be physical, that was what we knew, now, it can be, let's say spiritual too.
Still, the more I sit with this book, the more in awe I am at the five stars reviews. I think parts of this book were good, the grief part is well done. But there's a lot about the lore that is ... meh, either out of nowhere or soft-retcon, there's a lot of ilogical decisions made, and a lot of stuff that feel like Jim just needed to "fix" *cough Justine cough* in order to move on to the book he really wants to write: MM.
And the more I sit with this Lara/Harry/Murphy/True Love™ situationship, the more it feels like Jim just wants to push the narrative into a direction where there is a romance between Harry and Lara or at the very least, there is the titillating possibility of a sexual partnership, and so he just had to fix the whole Ture Love™ thing in whichever way he could, and this was his best.
This makes me concerned about where the series is going. I've been worried since Battle Ground, tbh, and this book did not soothe me. Why? Because to me this is an important part of the series. I know that the romantic life of our protagonist is not the main reason why most people read these books, and it's not even mine, but I'd said is not unimportant. For a guy like Harry who is very much about "where his heart is" his sentimental life is important, as it is his choice of romantic partner and his struggle to find them or keep them. I genuinely think that part is lacking in the series (we can do romance without going into paranormal romance territory) and my wish would always be that we get to see Harry actually fighting to win and keep the person he loves, he has never done that, and I thought it'd be with Murphy, but oh well...