From the in-game Book of Fables
Beast and his wife, Beauty, left everything behind when they escaped the Homelands in the Exodus. Without his former wealth, Beast must pick up extra work to make ends meet. He is able to get around Fabletown without a glamour most of the time, but if Beauty gets too angry with him he becomes more beastly by the minute, growing horns sand large teeth.
Despite the occasional bickering, the two are truly in love and have the longest lasting relationship of anyone in Fabletown.