(informal) best friend
A male partner in an unmarried romantic relationship.
A male friend.
a man who is the lover of a girl or young woman;
‘if I'd known he was her boyfriend I wouldn't have asked’;
A boyfriend is a male friend or acquaintance, often specifying a regular male companion with whom a person is romantically or sexually involved.A boyfriend can also be called an admirer, beau, suitor and sweetheart. The analogous female term is .