My Opponent left the game and started a new one. Pleae See. What should I do.

@cocob, when you play like a jerk, your opponent should respond with silence. Be a better sport when you win in the future please.

Why have you even created this forum? Just report him. Or you could always complain that you actually GOT rating instead of losing it. Your opponent could also report YOU for trolling so it's not just him who's breaking the rules.

Lichess should prevent people from starting a new game when an unfinished game is still in progress.

Yeah but wasting people's time is bad too

Triple isolated pawns! XD
And you needing 5 Rooks for a simple mate.

You really ARE on the same level.
And I still feel way more sorry for your opponent than you.