What is the biggest lie, by someone close to you, that you have been able to forgive?

Did your relationship suffer for it in the short term and/or long term?

Today I found out that someone lied to me, apparently to protect me from worrying. Whilst I believe that their motives were mostly good intentioned I am struggling to deal with the fact that this person lied to me and it’s really hurting me right now. I really don’t want it to tarnish my relationship with this person, who means a great deal to me, but I fear that I may struggle to trust them in the future. On the other hand, the lie was to protect me and so maybe I am being to harsh on them. I have asked them to never lie to me again, even if they think the truth will bother me.