We can't do much about it, just try to look at it as a positive side.
What I mean is if he's a cheater , then he's probably at your level cheater 1500,1600 hundred range, so what if he's using a computer assistance? Try and beat it ! Play better and if you loose it's a good practice for you try to learn each endgame and see how it's done.
I mean cheaters on my level as well and I'm not crying like you, but my level is sooooo much more difficult then yours, one mistake(not even a mistake more like an accuracy ) and it's over pretty much.
Any way no matter where you are playing or who you are playing you still need to improve and be stronger so man up and start crushing!
some users plays opening and mid-games bad. however they find the best moves on end-game and they doesn't make any sacrifice. I'm feeling like playing against stockfish.
I'm going to not play anymore on this platform. The cheaters are broke my balance.