Who else doesnt keep friends too close?

Many people claim me as their best friend. I get it is because im easy and i give everyone a good feeling once we meet and interact. Infact, people i meet through friends turn out to be fond of me than they are with the friend. Problem is i will not keep in touch with anyone and even though they may follow up through message or calls i will not allow myself to get connected emotionally to anyone. Doesnt matter if they had good intention. I prefer to talk when we meet but beyond that i dont commit to any form of bonding. I fear connections of any sort.