MILA KUNIS admits that it’s HER fault that she and MACAULAY CULKIN broke up.  On Dax Shepard’s “Armchair Expert” podcast, she said, quote, “I had a horrible, horrible, horrible breakup.  I [effed] up.

 

 

“I was an [A-hole] in my 20s and I’ll be the first to admit it . . . And it’s [effed] up what I did and it’s [effed] up how I did it.”

 

 

Mila didn’t say WHAT she did.  But when Dax asked her if she has forgiven herself, she said, quote, “You know, it’s been so long like I feel like enough time has gone by. 

 

 

“I think enough mutual friends have been like, everybody kind of forgave everybody for what went down.”

 

 

Mila and Macaulay dated for about 8 years, starting in 2002.  She’s married to Ashton Kutcher now . . . and Macaulay is dating former Disney Channel star Brenda Song.