GR translation: As she got along

[Mike Jing]

P218.22-34   But Sir Stephen has gone on: “. . . had a son, yes we
came complete with sensitive son, boy about your age. Frank . . . I
think they sent him to Indo-China. They’re very polite when I ask,
very polite but, they won’t let me find out where
he is. . . . They’re good chaps at Fitzmau-rice House, Slothrop. They
mean well. It’s been, most of it’s been my fault. . . . I did love
Nora. I did. But there were other things. . . . Important things. I
believed they were. I still do. I must. As she got along, you know . .
. they do get that way. You know how they are, demanding, always
trying to-to drag you into bed. I couldn’t,” shaking his head, his
hair now incandescent orange in this twilight, “I couldn’t. I’d
climbed too far. Another branch. Couldn’t climb back down to her.
She-she might even have been happy with a, even a touch now and then.
. . . Listen Slothrop, your girl, your Katje, shshe’s very lovely, you
know.”

What's the meaning of "As she got along"?  And who are "they" in "they
do get that way"?