When did we enter a world where girls actually care about if your penis is big? Look guys, the only reason he wants the surgery is for him, and partially for her. She didn't ask him to so stop telling him to dump her.
My boyfriend has about 7 inches, and it can sometimes hurt me, I just deal with it for him but thats 7... this is 9.5... no one can say the girl should just "deal with it" because you don't know what it's like. She might have a small vagina so it could hurt more?
Anyway, I think that if YOU feel you want it then do it, but research up on it a lot first, and by her saying she doesn't want to pressure you, that is saying she doesn't want to pressure you, not that she needs you to get it done.