Friends Becoming Distant

Does anyone find that some friends have dwindled and become distance or awkward?

I have always had a good circle of friends which I still have to a degree but a couple of them have become distanct.

One of them met a friend on holiday two years ago which is great, I make other friends too but I don't push out my long standing friends. She has done this with me. She doesn't contact me despite me having reached out to her so I now I no longer persue her. She is on Facebook out with this friend all the time and never contacts me.

Another long standing friend is always in contact with me because she has become very awkward and self centred since joining a walking group. I am pleased for that she has this, don't get me wrong, but every time we meet she insists we go for long walks and is critical of the things I like to do so I find that, although we are in touch, I am wary of meeting her now because she is so critical.

What do you do with friends like this? Do you hold onto them just to keep your circle larger?