while he may be lying by omission, I think he is doing this to give himself an easy life and build up their trust as a couple.
Yeah. No. Lying doesn't build trust.
He does not want to change his life for anyone , he has said this to her
But a relationship does change your life. It's kind of the point. I would make other plans tonight but I'm seeing my bf because I want to see him, not other people.
I would be sad to lose the friendship but am happy he has finally found someone who accepts him exactly the way he is
Except she doesn't accept him, because she's worried about you.
he has never had much luck in the romantic stakes and doesn't want to lose this girlfriend.
Then he needs to stop lying to her, stop touting his independence and make time for her. He needs to let her into his life and his trust, not lie, spend a lot of time with another woman he has substantial shared history with and then wonder why she seems to be insecure. I would be and I'd probably leave him to his independence and his friends.