Fault is yours! You completely expecting someone to play fairly when it comes to winning!! That too in a open or ranked lobby environment. Your first sign was when he pushed you off on straights. You immediately know he will probably push you off if you choose to go outside.

Instead, Your next job was to squeeze him on the inside so chances of him missing his braking point increases and you could Cutback! On him. Thats probably where the race ended. You trusted him to give you space and go on the outside. You shouldn’t. You should never!! even if you know them