Professor Green had a "panic attack" when he received 61 missed calls from Millie Mackintosh after a night out.
Professor Green and Millie Mackintosh
The 32-year-old rapper was married to the reality TV star for three years until their divorce in February and he has written a song, 'One Eye on the Door', documenting how he used to go on nights out and worry about how she'd react when he stayed out until the next morning.
He said: "The whole song is just about when you say, 'Yeah, I'll be home early, I promise', then your mates go, 'Come on, stay for one more drink'.
"Then one more drink turns into someone's kitchen, staying up until God knows what hour putting the world to rights.
"Then sunlight starts to appear through the curtains and you realise you have to face the music.
"You turn on your phone and have a panic attack about the text messages and missed calls.
"Then you go back with your tail between your legs saying, 'I'm really sorry, I won't do it again' ... until next week."
In the lyrics to the new tune, Pro - whose real name is Stephen Manderson - admits he knew divorce would be "on the cards" if he kept up similar behaviour.
He raps: "I'll probably get kicked out of my house, 'til I come back with a brand new Chanel bag and shoes but I refuse to wave a white towel.
"S**t, I'm dead - I don't know where the time went. Where's my phone? S**t, 61 missed calls. A divorce is on the cards if I don't split and get my a**e in gear."
Despite disclosing some of the details of his failed marriage, Pro insists he has "no resentment" towards the 27-year-old beauty and found it "really sad" that their relationship didn't work out.
He added to The Sun newspaper: "Ultimately what happened was two people got married -- not to get divorced -- and it didn't work, which is just really sad.
"That's the truth of it.
"Therefore I would rather just move forward. No resentment."
The rapper recently admitted he was uncomfortable with the attention surrounding his marriage to Millie.
He said: "I don't sell my relationships. That's not me. I'm not parading my relationships and I will never do that again. I will never ever, ever put myself in that position again where a relationship becomes ... that's not happening."