I think you know how to choose friends as you have had success in finding friends. The problem is that we have no control over whether they stay our friends if we have done nothing to injure that friendship. Sometimes we can do nothing to hurt the friendship and it still ends. I am so sorry that you lost some of your friends. I agree that when I have a friend that I do not need to be in touch with them daily. Sometimes I go a week or two and if I don't hear from them I call them to see if they are doing ok. Most friends seem to come and go. It is only some friends that we are able to keep no matter how many miles separate us or whatever time has gone by. I believe that you just haven't met the right kind of friends yet. If your heart is in the right place then that is the best platform for building new relationships and finding close friends. It will happen for you, Please don't give up.