Guys, it's OCD. The way he has his scenarios in his head like "I am the best footballer ever" or "I have to end my career with atleast 1000 goals to prove i'm the best goalscorer" and he cant accept anything that is against those scenarios is cery OCD-ish.
OCD people even with hard-to-achieve scenarios in their heads have it easier to change the reality so it's more adequate to their scenarios than maturely change their scenarios.
It's mentally easier for Ronaldo to train hard and play as long as his organism is letting him just to get those 1000 goals and to get as much trophies as he can so he can keep his "i'm the best footballer and best goalscorer in the football history" than to adapt his "scenarios" to the actual reality.
OCD players are perfectionists and they can become great players (like Ronaldo) but they are suffering hard asf in their heads if things are not going perfectly as they wish in their heads.
Ronaldo would be the first OCD player ever to fully adapt reality to his perfect scenarios, but unfortunately Messi was born. So he will suffer and play as long as he can to score every goal he can score and get every trophy he can get (even the smallest one, as long as it's official trophy that counts)
Let him score 1000 goals and be the best in his head. He's not an evil guy, he is suffering alot, let him have his peace, dont come at him with too valid argument that he may not be the best after his retirement, because he will cry and he will decide to go back to professional football to the official football league that is even worse than Saudi Pro League just to score 200 goals more so he can still cope that he is the best.
All this pain just because some little men was born back then in Argentina XDDDDDDDD