2. We love convenience. Not to seem dependent, but, yes, we find it favorable to know that we have someone we can call in a flash when we need help, that we can meet with people when we're bored or when we miss them, and the idea that we're going to school or the office with people we're already comfortable with just puts us at ease. Taking that comfort away only gives room for anxiety.
3. We're scared to start all over again. There you go with the feeling of anxiousness over making new friends, fitting in at an unfamiliar place, or the mere act of applying at a new job. Figuring out what will happen to us after losing someone and if we will ever be able to get past it bring us fear. The point of uncertainty just become eminent leading us to be hesitant on moving forward.
As we grow older, we start to learn to be more tolerant of goodbyes and to be better in braving the face of it. We might have pulled it off well but that doesn't mean it's finally okay. We'll accept it because we have no choice. Even more so, we still hate it.