I have very few friends. The ones I do have are very good though. I think it is because I have demonstrated I am a good friend. I am honest with my friends. I am open to their limitations. I do not criticize. I don't give advice. I make suggestions. I don't try to change, but instead use acceptance as a tool to allow them to grow more into who they really want to be.
The good friend doesn't feel slighted if you can't spend time. They don't have to talk to you to know that all is well. They can accept you need your space and allow you to have it.
My friend list may be small, but it is full of love.