All I remember from that home leg against Porto is that we should have been out of sight and then the calamity that was Porto's goal and Mourinho running down the touchline like an attention whore.
That's the kind of thing that made Porto fans feels great though. I really think it was genuine happiness. A young manager overly celebrating a last-minute win at Old Trafford is hardly something to criticize. Particularly in these away goal situations where you go from losing to winning without the "cooling off" draw period.
I don't know how well known this is, but it all changed very quickly though. He blew that relationship at the end when we won the thing.
He barely celebrated the CL victory at all and was having a terribly smug attitude when addressing the fans and press in general. Very quickly changed from a staunch defender of the team to basically ignoring the historical moment that was happening. There were some rumours going around that he was hitting on the girlfriend of an important and dangerous "ultra" fan (by text messages!), which led to him receiving threats from some of our more radical organized supporters group. These, already knowing he was tied to Chelsea (far before the end of the CL), had no doubts when deciding on who to take side with.
All those were just rumours, but rumours in a small city spread easily, and I don't remember opposing ideas, neither an alternative explanation for Mourinho's sudden change of attitude towards Porto in general. Even if we assume the above is true, it's very poor form from him to become smug with the overwhelming majority of fans due to personal problems with a dangerous minority with whom he decided to mess with at his own risk.
It wasn't enough to ruin the moment, but left an unnecessary bitter taste. In the years that followed he rarely ever mentioned us along with Inter and Chelsea in several interviews, when mentioning the places where he'd been "happy", and unless he was specifically counting his titles he didn't mentioned us either as an important stage of his career, and as giving him the platform to become what he his (after both Sporting and Benfica rejected him in different contexts).
He's not as fondly remembered by many Porto fans as what his success would lead you expect. And the reason he wasn't outright hated at some point, well, that's because he was too damn good, and gave us far too much in terms of success. Fortunately he seems to have gotten over whatever went wrong here, and in these last few years has thrown fewer digs and a more commending words at us.
Yeah, a prima donna. Even here, there had to be some drama. I admire him though, and give him the pass that the genius always get. He was nothing short of spectacular, and not just talking about terms of results. He was bloody good in the press room. Bolder and bolder claims each time, and always delivering them. And that was from the start, even before winning a single game.