You had recently joined justice league and so happened to also be arkhams most wealthy daughter heir of some trillionaire. You were looking through files while the other members were doing their own thing when the door bursts open and Bruce Wayne (aka batman) comes in and spoke out "where's my bride?" He was obvious referring to you, and after a beat he spotted you and his cold self instantly warmed up to a whole new different man. "Oh, there's my wife.." nobody on the team knew you were married