Saying you are childfree should mean you are childfree forever!

Looking through the posts on here about supposedly "childfree" people who had kids or wanted to have kids. They should just say they aren't sure right now about kids or maybe in the future. I have seen so many posts on here how heartbreaking it is to think you have a childfree friend and they change their mind. why is it so hard to have childfree friends and people in your life who stay childfree forever?!! I fucking hate it! I am so terrified of my sister who says she childfree now but wants to date and get married and that she will be pressured to have kids or change her mind. ughh I hate this feeling. I would feel so abandoned by her.