The Celebrity Big Brother star confirmed her separation from the artist last week and explained that she is looking to start "a better chapter in [her] life".
However, Katona has now said that she is having doubts about why she ended her nine-month relationship, suggesting that she pushed Alce away because she is "used to being mistreated" by men.
"I know I'm not being fair on Steve by splitting up," she wrote in her OK column. "I guess I'm a messed up person.
"I don't know how to handle being in a good relationship. I've never been loved by anybody the way Steve loves me - I'm new to this."
She continued: "Perhaps I'm so used to being mistreated I'm inventing drama or maybe I just got scared because we moved in together so quickly? I wish I knew what was going on in my head."
Katona also said that the break-up has brought back "really painful memories" of her failed marriages to Brian McFadden and Mark Croft, which she is revisiting for her autobiography.
Following the publication of the column, Katona reminded Alce on Twitter: "Your (sic) are beautiful person don't ever forget that xxxxxxxx."