Breaking the pawn structure
He played the Be3 line of the closed sicilian. I missed the move order and played e5 instead of waiting for him to play Nd1 first.
Later I captured on f4 which allowed him to capture back with the knight and control my weak d5 square even more.
Later he created a weak pawn on e6 and got the pair of bishops.
I played actively and was able to equalize.
After exchanges all the pieces we played a long bishop endgame: