Have you ever had to.....?

have you ever had to tell someone something which you know will REALLY hurt them, something that hurts you just thinking about it? i had to tell someone something today which someone told me, i didnt want to know and spend 3 horrible sleepless nights stewing on whether or not to tell her and i did.... i know i did the right thing but seeing the shock and hurt in her eyes... i cant get over it, now because i have told her its very awkward for me, not with her with others, which i dont care about because i KNOW i did the right thing, but i just cant stop thinking about it and seeing her face, i dont know what to do, i keep crying and know i shouldnt, she cried and now is angry, i just want to move on from the hurt, how do i do this?