This is the reason why it's always good that player's decisions are respected sometimes because mpappe thought that he has to leave PSG so he can win the champions League and ever since mpappe left PSG has been moving forwards getting results and winning trophies
You people are overrating this Mbappe situation. Did he go to Madrid to win the UCL every year? His leaving PSG, does it mean PSG will never win the UCL? He moved to a team he has always liked as a kid, and there is nothing wrong with that, even if PSG wins the Champions League while Madrid doesn't. Mbappe will have more opportunities to win the UCL with Madrid.
This is a player who has done everything for PSG, he is the highest goal scorer in their history. He even delayed his move to Madrid for about 2 years to remain in Paris, so I don't see the big deal in this.