"You took the piss too much"
DP cannot sing. She has a lovely voice, and can produce a lovely tune with it sometimes. But that tune is not the one playing in her brain, and if she tries to sing along to something, or tries to a sing a song expecting me to recognise it, then it is the most out of tune, out of time thing in the world.
And it was the source of much amusement to me and DD, and anyone else who listened. Not in a mean way, at least not intentionally. It was one of the things I loved about her, just like all the other flaws that a person has that make you fall in love with them.
And then one day we were sat in the car and her favourite song came on the radio, and she didn't sing along to it. And I realised I hadn't heard her sing in months. "You never sing any more?" I asked.
"No, I don't. You took the piss too much"
I have been lied to, lied about. Insulted, screamed at, sworn at, accused of things I didn't do by various people over my life. None of them hurt as much as that did.
Because it was true. And because it meant that I was a shitty human being. I'd stopped the person I loved from doing something she loved.
Obviously I apologised hugely, grovelled, offered to do whatever I could to fix things. DP accepted my apology, but she didn't start singing again, not for years.
She does sing again now, initially when she thought no-one could hear her, then when she thought I couldn't hear her, then quietly in the car with me, and now she will happily belt out her favourites within earshot of me. But it has literally taken years for her to show me that piece of her again.
So that is the worst thing I've ever heard, because it shone a light on the worst thing I've ever done.