Are these correct:
1-She accuses me of not helping her out on Sunday because I do not like her boyfriend. That is untrue. I just could not help her. I had a prior engagement on Sunday.
2-He accuses me of not liking him because he is my ex-wife's brother. That is nonsense. I really do like him.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.