That's fine. It really is one of the hard bits, isn't it, seeing some people as in your life and others as no longer in your life. It is sad, but it happens. I think you are doing exactly the right thing by concentrating on new friendships and continuing ones with people who seem to understand what you are going through. i only have a couple of friends and they are pure gold.
I'm 57 so your stage of life is quite different. You know it better that I do. And I am glad you seem happy to just chat.
H