How GM Sergei Zhigalko Destroyed me .

Greeting Every One!
Yesterday, I Was scrolling through lichess when I saw Gm Sergei Started a Simul and Because I Love Playing Against Chess Masters I Joined. The Simul Started When 68 People joined and He chose 8 people from it and one of them was me!
I was so excited to play!
I played The Nimzo-Larsen opening and we continued the game and I big castled Which Was a Mistake. Because He started Running his Pawns Up To My Casteling Position I couldn't do anything about it!
After that, he mated me with his Rook .
This is the game if you want to see it: