あなた～

CASE 1 My darling to boyfriend : (firstname)くん～ or nickname in a deux to girlfriend : almost say firstname or nickname in a deux to husband : あなた～ to wife : おまえ～ or firstname CASE 2 Friend's darling to boyfriend : かれし to girlfriend : かのじょ to husband : だんなさん or だんな or ごしゅじん to wife : おくさん or おくさま

darling = "ダ一リン". Japanese use katakana to pronounce the words imported from foreign languages.