Caroline Flack has been named as an ambassador for the Teenage Cancer Trust
The 32-year-old Xtra Factor TV presenter briefly dated the 18-year-old singer and has opened up to Look magazine about their relationship, which provoked a strong reaction from One Direction fans.
Caroline said: "I'm surprised - it's tough. I didn't kill someone, I just went out with someone younger.
"But there have been more positive reactions than negative ones."
But the TV presenter - who has just been named as an official ambassador for Teenage Cancer Trust alongside Liam and Noel Gallagher, Kasabian, Edith Bowman and Eddie Redmayne - doesn't want to forget the time she had with Harry.
She said: "I wouldn't edit anything out of my life. I learnt the hard way that the easiest thing is to keep it to myself.
"With the whole Harry situation, about 95 per cent of what was written was false. I didn't really know where to begin.
"But I've developed thicker skin and become more hardened to it. I don't get as upset as I used to, but I'm still human."