Question about my Mercy gameplay..

So I am playing QP, our game went for 5 minutes long about on the dot. I had about 5000 healing, and like 60% healing and 40% damage beam.

My tank literally kept pushing ahead too far and the dps was running ahead and not grouping up.

The tank kept saying “heal me” and then typed never play sup again mercy.

Luckily one the dps “not mercy’s fault”.

Was a bad player here or literally just playing qp and trying my best? idk just wanted some insight! thank you!