they want u as a free sex escape, isnt it obvious enough? unless he looks like a hunk still n no stds.. mayb u can just play along with him for one night.. ha ha n make sure he is not some senior guy in some extraordinary post where wife is planning to catch him on adultry. if not really... with yr looks since yr ex r still interested =p surely u can do better find some hunk to satisfy yrself ha ha