Christina Milian and Nick Cannon’s romance kicked off shortly after their film Love Don’t Cost a Thing in 2003. The couple split in 2005 and Milian has revealed what caused the breakup.

During an appearance on E! News’ digital series “Just the Sip”, Milian said that she hacked into then-boyfriend Cannon’s phone and did some snooping. “When I was dating Nick Cannon, the password somehow worked on the first check and I was right and the next thing you know, I was reading for like a month. I was reading messages,” she said. “I was stuck in Romania. I had time. I cannot bust him when I am away. I need to bust him in person so in the meantime, I’m going to get my intel, make sure this is for real for real and it was for real so it was enough.”

Milian continued, “We were just so close that I think at that time, I couldn’t deal with the idea that if we ended up breaking up, I wasn’t going to get to see him again. So I wanted to be able to see him in person, go over it—not like it would change anything—but part of me was like he was my first love. It was unreal that it was happening. He was living at my house. Right under my roof this is happening? It just kind of blew me away.”

Nick has since addressed Milian’s story about him cheating and told his side of the story. “I don’t think I did anything wrong. I wasn’t cheating, you got to be in a relationship to cheat,” Cannon said on his Power 106 radio show “Nick Cannon Mornings.” “We not going to get into the details but I would say the way I believe if, she went through t my phone and all that, and back then is what I told her and I will tell her now, but if you go looking for something you gone find something.”

He then said, “And I’m going to tell you this, if a man, I’ll speak for myself, if I am careless enough to allow myself to get caught then that means I wanted to get caught. The word is careless, you know what careless means…I could care less. I was at an age where I didn’t care.”

Nick later revealed that the password to his phone was “0-0-0-0.”

Check out Nick Cannon speak on him allegedly cheating on Christina Milian below.