The Love Island presenter who was due to go on trial on 4 March for assaulting Lewis Burton, was reportedly found dead at her home in east London.
The former host of ITV2’s Love Island was also forbidden by a judge from communicating with him before the trial.
Burton, an English Tennis player who also did not support his partner’s prosecution, took to Instagram after hearing the sad news about Flack.
He posted the picture of them on a private vacation, on Sunday morning with the caption, “My heart is broken, we had something so special.
“I am so lost for words. I am in so much pain. I miss you so much. I know you felt safe with me. You always said ‘I don’t think about anything else when I am with you’ and I was not allowed to be there this time. I kept asking and asking.
“I will be your voice, baby. I promise I will ask all the questions you wanted and I will get all the answers. Nothing will bring you back, but I will try make you proud every day. I love you with all my heart.”
Flack presented many of UK television’s biggest reality TV shows and their spinoffs, from The X Factor to I’m a Celebrity, Get Me Out Of Here Now!, and won the BBC show Strictly Come Dancing in 2014.
Many of Flack’s former colleagues and friends paid tribute to the “warm and funny” entertainer on social media.
The BBC Breakfast presenter Dan Walker tweeted: “Awful news about Caroline Flack. We really need to be better at taking care of each other.” This Morning presenter Phillip Schofield added: “In a world where you can be anything, be kind.”