Does it really matter? I don't think that giving grades to our friends is a good thing. I also think that different people in our lives can be helpful and supportive in different part of our lives and that feeling like one person alone deserve that title is limiting and unhelpful.
I think that it's important to built a community around yourself, to have friends and interact with people as much as possible, to be supportive of others and to accept their support. Some people are great to talk to and some are great to watch a game with, or go out for a concert, some would be supportiveabot work and not really interested or fun to talk to about family relationship for example - the important thing is to make a social situation for yourself you feel comfortable and satisfied in.