The older I get the more I see it that way more plainly. Even my enjoyment of Juve has become more about the enjoyment of knowing the ins and outs of the team, tactical things, analyses and discussions about it with people rather than allegiance to the team itself. I haven't actually liked the quality of our performances for a few years now and find more entertainment watching Liverpool and City push each other to the limit.
It could also be that the emotions died out a lil because I am more busy, and Juve has been playing like shit for a few years. If we were at their level and competing on all fronts maybe I'd have retained more passion while watching our games. Recently its become more about dissecting, analyzing and discussing Juve as an outlet more than actually feeling excited/disappointed or deeply engaged at the emotional level while watching.