AIBU to be sad over my shrinking friendship circle?

[Neetra30]

Hi everyone,
I would like some advice specifically from those who have gained and lost close friends over time and how they have learnt how to make friends and trust them again.
My friendship circle was already small to begin with but 3 years ago I made a new friend via work. We became very close, especially when I had fallen pregnant. She organised my baby shower and visited me in hospital when I gave birth to my child. I even introduced her to my child's father and we have visited each other at our homes.
However my friend had decided to move away (3hours away) which meant that gradually, she was communicating with me less.
It got to the point where she barely made any contact at all.
I already had trust issues before I met her, when speaking to my other friend, she advised me to not over share in future.
Now I feel like a complete moron and at loss. I'm still human, I would like some friends for me to speak to regarding good days and bad. I would like to make meaningful connections.
Is there any hope to have any close friends in the future? Was I a moron for wanting close friendships in the first place?
What doesnt help is that the older I get, the smaller my friendship circle has become.

I already had trust issues before I met her, when speaking to my other friend, she advised me to not over share in future.

??? I can’t see what friend has done in order for you to not trust her, and to feel like a complete moron? Her moving away is not about about you. If a friend moves away then it is unfortunately likely that your friendship will drift. Finding friends locally is important - new friends are always nice, and it will likely be a mix of (mainly) casual friends and if you’re lucky a few really close friends.

I don't think anyone is in the wrong here, friendships do tend to ebb and flow and moving 3 hours away will have an impact.

Four of my friends moved overseas when we hit our twenties and thirties. I saw them far less but remained in touch. People do move around, I have relocated twice.

Introducing partners and going to each others homes is quite normal, the hospital visit is next level and I would say for very close friends only. I would say over sharing very personal information very quickly is not a good idea. I met a nice woman in a walking group recently. As soon as she felt safe which was second time meeting me she shared some really personal information, the sort you would share with a very trusted friend. She is nice but it has really put me off developing a friendship with her. Is that’s what your other friend means?