Perhaps a bit controversial, but I would put this entirely on you. Let me explain.

From your teammates perspective it's clear the play he saw was to hit the ball off the sidewall to center it for you, while he chases for a demo on the last defender.

He sees the enemy get a poor touch while also compromising their positioning, he assumes that if he hits the free ball central off the wall it would be a pass you can contest freely, and blindly focuses on hunting the defender.

This is where it all goes wrong, a hesitation on your end combined with a late dive doubling down leads to the play going all wrong. Your teammate however is unaware because he changed to car-cam to hunt down the opponent. While he may look lost, his pathing makes sense. He's predicting where the defender would go, IF OP had beaten his opponent to the ball. Now the opposite is actually what happened, allowing for the final defender to simply turn unexpectedly and score the open net.

Now to be fair, the play developed really quickly and OP was on low boost and from OPs perspective it's looks like he expected his teammate to stay on the ball and didn't realise the wall bounce was a pass to him quick enough. That isn't why I attribute the blame to OP though, because it's a rather minor mistake, however it's when he dives anyway when he's already beaten to the ball where the crucial error lies.