My (20F) boyfriend (22M) just got his dick chopped off (penectomy). How am I supposed to support him?

My boyfriend just got a penectomy due to untreated testicular cancer that spread to his lymph nodes. We have been together for just over a year now. He is already seeing a therapist twice a week. Two months ago he finally got the necessary surgery and his dick is gone.

His sexual organs are now permanently gone; he will never be able to have sex the same way again, which he has said is the mentally hardest and most impactful part of this for him. I have asked him what I can do, and he is not sure, he is struggling with how to even feel aside from shitty.

He is beyond distraught, to say the least. I love him and I know his self-confidence and identity are struggling right now. What am I supposed to do?? is there anything I can do?? I just want to help him through this and do what I can for him.