Hasn't been interested from day one? Don't try to rewrite history, it just makes you look bitter.
He took a step down to join us from Juve when he came here. He was sold an ambitious project from Mourinho like many others at the time, unfortunately it never worked out. If the club had competed for the top trophies in his time here, or shown proper ambitions to compete for said trophies in the future, i'm sure he would have stayed here for many years.
We have a very young team, he's coming 27, can you see us competing for the top trophies in the next 1-2 years? If you can't, then can you honestly blame him for wanting to move on?
He's one of the best players in the world, players peaks are short, anything can happen any time with injuries etc.
Us as fans can see the owners limited ambitions, turning us into a sinking ship, i'm sure the players aren't stupid either.