The TV presenter admitted she didn’t even realise that she was being cheated on at the time because she wasn’t sure if their relationship was serious.
Speaking to Joanne McNally on their My Therapist Ghosted Me podcast, the 36-year-old explained: “I've been cheated on and I didn't have a clue. Why are people cheating on us?
“I remember I said it, ‘We weren't even together at the time,’ [but] we were actually.”
Vogue added that she feels “embarrassed” for the cheater for being so horrible to her.
“Do you know what? I don't actually find it embarrassing when I think back on it. I'm like, ‘I'm embarrassed for you for being such an a******e.’
“It's actually them that should feel embarrassed because they did such a s****y little thing.”
The Dubliner has previously opened up about getting cheated on and even said that she was “thankful” that it happened because it shows a person’s true colours.
“I find [cheating] outrageous! Even finding out after you're still like, ‘Aw man!’” she said on the podcast last year.
“You feel like an idiot, you feel so disrespected, and you just feel like, ‘You know what? I’m f***ing brilliant – why did you do that to me?’
“But then actually, as years go on and you look back, you'll be like, ‘Thank you, thank you!’ Get them a thank you letter and thank them for cheating on you because I am so thankful.”
She continued: “We all go bonkers when we break up with somebody - stalk them on social, everything like that, you can’t help yourself but dig deep.
“When you get dumped, you just go into this like ‘Nobody else exists in the world’ [way of thinking] even if it's the worst relationship in the world ever. You're just desperate to get back with them for a certain amount of time.
“Now when I look back on certain relationships I'm just like ‘Oh God, thank God that didn't work out,’ whereas before you’d be devo.”
Vogue is now happily married to former Made In Chelsea star Spencer Matthews after the couple tied the knot in June 2018.
The couple have three children together: three-year-old Theodore, one-year-old Gigi, and newborn baby Otto, who arrived into the world on Easter Monday.