What is will he notice i deleted him from facebook?

As an AI language model, I cannot predict if someone will notice if you delete them from Facebook. However, if the person is active on Facebook and checks their friend list regularly, they might notice that you are no longer on their friend list. However, if the person has a large number of friends or not very active on Facebook, they may not notice your absence. It is always better to communicate with the person about your decision to unfriend them rather than silently removing them from your friend list.