Following recent comments about his happiness at Madrid (via The Sun), Ronaldo must realize that he's in an amazing situation right now in Madrid.
He has the finest manager in club football with him at Madrid in Jose Mourinho, who along with Ronaldo, is one of the faces of Portuguese football.
Not only does Ronaldo have a great manager focused on winning trophies at Madrid, the club also has a few of his Portugal teammates in the squad. Defenders Pepe and Fabio Coentrao, both of whom are quite capable at their respective positions, regularly feature in the Portugal starting XI during international play with Ronaldo.
Ronaldo is in a perfect environment right now. He has a great manager, a whole squad of world-class teammates, and millions of fans (many of them who also support Madrid) who adore him.
Ronaldo should spend the rest of his career in Spain, and if he ever wanted to leave, he should not do so until he leads Real Madrid back to the summit of European football.
After collecting every domestic trophy there is to win during his brief tenure in Spain thus far, the only goal left to accomplish for Ronaldo at Madrid is to win the Champions League. He owes it to the club and the fans to finish the job and help Madrid lift the Champions League trophy before his club career in Spain concludes.
After winning the European Cup three times from 1998 through 2002, Madrid haven't even played in a Champions League final in a decade.
If Ronaldo doesn't feel like he's making enough money, it would be unfair to question him. Sure, he's making a lot of money from his contract and endorsements, but it's important for everyone to make sure they are being fairly paid for what they contribute to their employer.
Ronaldo is at a historic club, makes a lot of money, has wonderful teammates around him, and has an opportunity to win multiple trophies each season. All he needs to do is look around him, and he will probably find the happiness he wants.
Madrid is the perfect club for Ronaldo, and it's where he should finish his extraordinary football career.