ocean
most likely. or they are confused why you just vanish because they are not aware of how you feel or why you are reacting to them that way all of a sudden..
im learning to tell people where my boundries are, and when i need to take space. we all do. if they accept it then they are my friends. if not then time to find healthier friendships.
most importantly tho: find out what upsets you and makes you react this way.