Well what you said here is true because looking at what psg displayed at the day of the final it was unexpected and I believe many people were shocked. After psg scored there second goal in that match inter Milan lost all confidence and that was the beginning of there losing. However it is not an easy thing to qualify for champions League final,  inter Milan has quality players but I don't really know what happened if it was over confidence. Depesite that they lost , I believe they have gathered experience that will really help them this season. All they need is just to restratigise there pattern of play.

Inter Milan defeat in the Champions League final proves that winning is not only determined by the quality of the players, but also by having a winning mentality, which will boost the confidence of each player. We can see that in the match, after PSG scored a goal, the confidence of Inter Milan players wavered slightly, making it difficult to create a counterattacking momentum to even the score.