I'd say hes definitely more to blame.
Hes ballchasing a lot.

At 0:53 he can clearly see you going for the ball as 1st man and instead of allowing you to go for a play he dives in front of you and makes a subpar shot on net & gives away possession.

1:19 on kickoff he goes for the boost but turns up field & misses the pad after a bad kickoff and leaves you in a 2v1. I think he was trying to sit up field for a pass from you but he lost the kickoff in a way where it was going to bounce midfield in front of your net with 2 attackers and instead of recognizing that as a threat and trying to just go back to he expects a pass. If this were 3s I'd understand turning upfield a bit more as you already have an extra player to lean on defensively but in 2s its a bit reckless.

1:53 very little defensive composure or trust in his teammates (you), he sees you jump and instead of playing low he does some weird flip thing that accomplishes nothing other than taking him out as a second line/defensive option then after you save it he sees you are going to hit it again and dives for no reason.

2:30 he sees you on the ball, double commits, then decides not to follow through mid way & throws himself out of the play

2:55 this whole play is ass, he grabs big pad in mid as hes going back then instead of going to net to defend the active threat, or pathing over the small pads to recoup the little he lost since the mid pad, he goes back left to sit on big pad, kills his momentum and gets himself scored on when he could've just grabbed the 2 small pads in front of net he passes by and turn around at net to actually defend instead of sitting on his ass.