Sorry its a little odd this one.
if your DP keeps accusing you of having an affair ,when it is obvious you aren't, does anyone think that infact they are trying to you that they are having one?
From alot of the threads it seems to start with one partner telling the other all their bad points and reasons why they are without doubt the worst person on this planet. Maybe im a little paranoid maybe im right im sure there are others who will know better.