他对我很好,我不想私下做对不起他的事情It's very kind of him ,and I don't want to offend him.
He was very nice to me,
I'm sorry I do not want him to do things in private.
He is very kind to me, I don't want to privately do anything which makes me sorry about him
He cares much for me,I don't wanna do something guilty for him in private.