The first three separate Google dictionary definitions of the adjective “selfish" are”
“lacking consideration for others”
“having or showing concern only for yourself and not for the needs or feelings of other people”
“devoted to or caring only for oneself”

According to these definitions:
You can not be selfish if you have consideration for anyone else.
You can not be selfish if you have concern for anyone else.
You can not be selfish if you care for anyone else.


So if John Galt was selfish, he must have lacked confederation for Dagny, had no concern for Dagny and did not care for Dagny.
There is a contradiction here. Either John Galt was NOT SELFISH or the common definitions for “selfish" that most of the world uses are WRONG.

Can most of the world be wrong? Is that a rhetorical question?