Can you imagine being Foxy's husband and not wanting her to become the extremely sexy woman she has become? According to her, he did not allow her to engage in all sorts of things, which apparently, included getting implants. So implants were the #1 thing she got after dumping him, and then she liked the attention and the way they made her feel about herself so much that she just wanted to keep making her boobs bigger and bigger.
I'm sure her ex is just like so many friends I have known that find a D cup about the limit of what they want in a GF and wouldn't think of being part of the spectacle of being in public with a girl with 1000cc implants, let alone 5k or 10k. It isn't about what the girl would like, it is about what they would like and they have no tolerance for a girl that may have to walk a bit slower or more carefully, or may not be able to do some things easily because of the size of her fake boobs.
On the other hand, I find a girl with enormous fake breasts stunning and no doubt fascinating to watch. I would certainly feel less than worthy when seen with her in public, but that would never alter my desire to be with her. And it would make me feel great having to help with those things that her boobs make difficult.
I guess it is more a matter of respect, whose priorities come first, and what happens when interests collide.