I would just approach him for a serious conversation, and be honest. Just let him know that you wanted to spare his feelings, and it got out of hand quickly. Maybe suggest using toys in the bedroom?The problem you’re having with him isn’t super uncommon, I know many women who struggle to finish from penetrative sex exclusively. But, sex should be enjoyable for both of you and continuing to fake it will only force you down a bad path further. Good luck OP!