Yes, we are really sorry for Mbappe, he tried to give more to the team. As you said, Real Madrid's comeback from a three goal deficit was not credible but I believed on the contrary that they could. Real lost in a match to save their honour although they were under a lot of pressure and had a high goal deficit and Arsenal are a strong team. Before the match Mbappe and Vinicius had the confidence to win but they were not found sufficiently on the field they lacked a strong attack. Arsenal victory could have been written in the first leg as they were excited and confident in the second leg which gave the fans a different motivation and prepared them even more for the final match.
Arteta thought it all out very well, they played great in defense and used all their attacking opportunities perfectly, I didn't expect Arsenal to beat Real away, but Real's defensive problems are now clearly evident and in the return match they should have been more involved in attacking, so there were gaps in defense, more space for Arsenal's attacking players. Mbappe thought that with Real he had a better chance of winning the Champions League, but Real is already out, and PSG is in the semi-finals.)