Ex (relationship)
PERSON WITH WHOM A PERSON WAS ONCE IN AN INTIMATE RELATIONSHIP
Ex-boyfriend; Ex-girlfriend; Ex boyfriend; Ex girlfriend
In social relationships, an ex (plural is exes) is someone with whom a person was once associated, in a relationship or marriage. As a prefix, ex- can refer to a variety of different relationships; for example, one might refer to a music group's ex-guitarist, or someone's ex-friend.