I have a lot of close friends in college, most of which are female. Some of them barely talk with me now. I have no idea about why, and I don't ask why.
People have relationships for different reasons.
The first reason is that maybe they live together. They meet each other everyday, and they talk now and then. Then at one time, she said to you: Will you go the the mall tomorrow? Maybe we can go together. You answered: OK. Let's go together. I need to buy another mini-shirt anywhy. Then you guys go shoping together, and talk all the way. You start to feel that you know something about her, and she is kind of your friend now, and vice verse.
The second reason is that you feel that the other one is so unique in the world, or at least, that person is so unique for you. You want to keep in touch with him/her, even when you are far away from each other, even when you have to take a train for 48 hours to stay with her/him for just 2 hours.
The third reason is the things the other person can provide you. When you are hungery, someone make you a bowl of noodle. When you are sad, someone come and appease you. When you are lonely, someone come and eat and drink with you. Whoever is ok with you if only they can satisfy you or acompany you.
