So being child free is not the same as not ever being around children.

I am child free and would probably have a child free wedding, but that's because there are not a lot of little ones running around my family. I have a niece who is 12 that I would absolutely NEED at my wedding and she acts like an adult so with her included I still see it as a child free wedding. But if my partner and I had more young kids in the family, I can see us having kids at the wedding, but I'd be child free in regards to my guests bringing kids I didn't really know.

Sebby and Addie have decided to have children at their wedding. This has nothing to do with you. If you are so terrified of children you can't share space with them, then don't go. But to make this out as an affront to you and your lifestyle is so remarkably selfish and ridiculous that of course your girlfriend is wondering what future there is with you.

These people having children at their wedding is their decision, and as I mention in my first paragraph, a lot of people rethink what they want as they age, their circles change, etc. Or, maybe Sebby did cave to pressure from family, and if so, who cares? How does you not going change that at all?

Sit there all alone on your moral, child free mountain top, and watch life pass you by.