I think you are withholding the truth from me; please tell me, however painful it is.

我想你一直对我隐瞒了真情，无论真情是多么令人痛苦，请告诉我。

youdao

Patient: Doctor, please tell me the truth. What are my chances of recovery?

病人：医生，请告诉我真相，我有多少几率能康复？

youdao

Please tell me the truth; is there a Santa Claus?

请告诉我事实真相，有没有圣诞老人？

youdao