The antonyms for the phrase "being beside" are quite diverse and depend on the context in which it is used. For example, if we are talking about a physical presence or location, antonyms might include "being far away," "being distant," or "being apart." If we are discussing emotional or mental states, antonyms could be "disconnected," "unrelated," "unformed," or "immaterial." In terms of relationships, antonyms for "being beside" could include "being estranged," "being distant," "being ignored," or "being rejected." Overall, antonyms for "being beside" indicate absence or separation from someone, something, or a particular situation.