I’ve actually been through this OP. I understand your feelings. You had children, a massive life change and you expected your best friend to take an interest in the biggest part of your life and you feel disappointed that she hasn’t. You expected days out with the kids, maybe she said she’ll be a great “auntie” to your children and after they arrived, none of that happened. You wonder why she hasn’t any interest, you’re the person that gets involved in friends news whether it be a house move, a new baby or a marriage.
Your feelings are valid!
The reality is, although your kids are the biggest part of your life. They are not to others. It is normal, although sometimes upsetting. Your friend chose to be your friend. And it sounds like from what you have said she is a good one?
Most woman who do not have children will never understand it consumes you. Even if you do have children, it doesn’t always necessarily mean you want to be part of your friends kids lives. Your friend is now pregnant and she is now living in it. She is consumed by the thought of her child, it has now become her world and she will now understand how big of a deal this is.
Perhaps she had other issues going on, infertility, losses etc that made her pull back. Perhaps she just had a lot going on in this crazy life and only had the energy to be a good friend.
I would give her grace. If you want to be there for her now she’s having a child, be there. If you want to pull back and be angry, do that. But I promise it doesn’t make you feel any better.