Trying to find a short story

It’s a story about a boy who is into sci­ence and tran­shu­man­ism, and a girl he told about all these crazy things that were go­ing to hap­pen. He dies and all of the things he said started to hap­pen. She ended up float­ing around Saturn re­mem­ber­ing him.

Either he or she was in the wheelchair. He was dy­ing and he was dis­ap­pointed he was dy­ing be­cause of all the cool stuff that was go­ing to hap­pen that she was go­ing to be around for, and some of it had to do with what­ever prob­lem she had that was go­ing to get fixed.

Please help me find this story if you can.