Leaving the field before the game ends tells a lot of story about Ronaldo to be fair. I agree with most people that he is still a good player, or at least good enough to be considered playing in United. yeah if he was in another club, like lets say City, or PSG, then it is obvious that he wouldn't be considered for striker position because there are better players there. But who do United have that could be considered better? I would say him leaving the field is saying it clearly "either use me, or let me go" and thats it, if they could let him go, this guy could still find a good place for himself. This is the guy with 800+ goals in his career, you can't just bench him, its not acceptable.
We don't know what's going on inside Manchester United actually. Ten Hag also gave an answer that I think raises questions every time he is asked about Cristiano Ronaldo, on the other hand Cristiano Ronaldo acts like he is not appreciated in this team and again it causes public reactions about him. This is purely an internal matter, and I hope they resolve this as soon as possible, because maybe it will affect the team.