The Bachie star posted a sweet black and white photo of her ex.
"Shout out to this wonderful human who despite all the bulls**t we've gone through as friends, lovers or partners has supported me and encouraged me to do all the things I've ever wanted to do (even when my choices have been questionable)."
Adding, "Forever greatful (sic) for your endless kindness."
The former couple got engaged to in December 2017 before calling it quite in mid 2018.
Alex, who is mum to eight-year-old son Elijah, famously won Richie's season of the Bachelor.
The exes are set to spill on their split on the Ten spin-off.
Check out their HEATED confrontation below...
"The circumstances of our break-up were quite brutal," Richie has shared.
"I don't know if Australia is ready for the grubby details surrounding it."
While Alex has confessed, "Richie and I do not talk anymore and I do not want to meet him in Paradise."